(ADDED)

The Pact: The source of the majority of these perks.  The Pact is the contract all members must sign in order to join.   In signing,  they accept a binding seal that ties them to the guild and gives them their "Guild Tattoo" Which is actually the mark of this pact itself.  The terms of individual's pacts can be renegotiated in time,  allowing more to be granted by the Pact and so on.  But the standard pact to join dictates the following:
• You cannot act against the interests of Grim Heresy.  (You cannot intentionally sabotage missions or plots.  You cannot attempt to harm the guild as a whole or guild property, more than the usual rough housing.)
• You cannot divulge secrets of Grim Heresy.  (You cannot tell or show someone where to find the Guild Hall,  who members are,  or any information about them unless permitted.)
• You cannot deny direct commands from a superior authority.  You can, however,  refute/question them,  or report to that said superior authority's own superior authorities with concerns. 
• Your soul belongs to Eris, the guild master.  Meaning if you should die, you are contained in Eris's underworld/afterlife allowing her to easily resurrect you,  and no other entities can claim your soul unless this contract is broken.  OPTIONALLY:  This can make the player character undead at their discretion.  Unless an ability is dedicated to it however this is just cosmetic and a technicality. 
• This contract can be willfully broken at any time.  To do so is an exertion of willpower and almost difficult to do.  Not something to do casually and certainly not by accident.  Once that exertion is broken through,  the contract breaks... And the individual in question loses all memory of Grim Heresy and all benefits gained from the contract.   They are, however,  now free.  The Guild Mark vanishing from their body and their soul returning.  Grim Heresy may hunt them down from then on,  or kill them on the spot.  This is situational.  The broken contract already will usually make them not a direct threat to the secrecy of the guild or so on.  It depends on their actions.   It may be harsh to be hunted down by an organization you don't know anything about or know what you did. 

Various terms and conditions can be altered and tailored to what is at hand.  Generally however without what is shown here,  you would be too much of a liability to involve in major guild activities and a security risk. 
The Pact supersedes all other forms of oaths and promises.  Other oaths or control effects that would attempt to make them break or go against the pact are negated unless of equal rank to Eris, the source of the Pact.  In which case both effects negate one another temporarily alerting all parties relevant to some sort of breach. 

Because of the nature of the Pact and how its mark serves as the "Guild Tattoo",  it can be hidden or displayed at leisure.  Fading or reappearing on their body.  They can pass full body inspections without worry.  It cannot be forcibly revealed/detected against their will.


Prayer / Call Master: Any member of Grim Heresy and affiliates can say the guild master's name three times,  and she will be able to offer her direct support, or send reinforcements your way.  This is not an official "Guild Perk" but a perk anyone in the guild can benefit from.
Alternatively,  this can just be used to ask for a portal to somewhere.   To avoid annoying the Guild Master,  do try to not abuse it.   Consider it similar to radioing into HQ for air support or an air lift.

Pact Bond: Guild members are able to automatically sense other guild members and individuals baring the mark of Eris's contract unless otherwise noted. This works on sight, but can also infuse their aura, so if a member can sense another member's aura they could sense the mark itself as well. 

Master's Touch:  Guild Members can benefit greatly from their Guild Master's power.  Eris can serve as an IC excuse for any change in appearance as Eris is very capable of remaking the bodies of those who follow her.  If one body becomes compromised,  or you simply desire another,  all can come to Eris to have their bodies remade.  New magics can be granted,  train any secondary,  "build" any boat or building,  ect,  and cure any curses or loss of limb.  
Those who die have the IC excuse of resurrecting due to Eris bringing them back (via Sacred Altar as usual).  They are called the Undying after all, which has literal meaning here. 

Undying Servants: Guild members are able to, at their discretion, command a measure of the undead serving the same goals and agendas.   So long as the member is doing so in the name of Grim Heresy and is in line with those goals,  they are able to command an NPC force with authority based on their rank.  These use the default summon rules for a summon of its rank, but do not have special abilities.  Only used for determining basic damage and hp.  At A-rank the undead can be other forms of undead other than basic skeletons.
D: 1 standard D-rank skeleton.    C:  3 D-Rank skeletons.  B: 4 D-rank skeletons 1 C-rank.  A: 12 D-rank skeletons, 6 C-ranks,  2 B-ranks, 1 A-rank.   S:   24 D-ranks.  12 C-ranks.  6 B-ranks. 3 A-ranks.  1 S-rank.   H: 48 D-ranks.  24 C-ranks.  12 B-ranks.  6 A-ranks.  3 S-ranks.  1 H-rank. 
These are not summons,  but are actual physical assets.  Only half the amount can be used in jobs, and treat the character as 2 ranks less.  So an H-rank is considered an A-rank, and the normal A-rank amount is halved. 
If there are multiple Grim Heresy members at once,  half the amount each gains past the 1st member, halved a second time on the third,  ect,  rounding up. 
Harvesters can call +50% the amount (round up).  Aces/GM can call twice the amount. 
Because they are not summons,  they are treated as normal NPCs and have no special courtesies or OOC protections.  Effects that could easily screw over NPCs easily screw over these; as they are NPCs. 

Name: Grim Blasphemy
Rank: H+
Type: Defensive 
Duration: Topic.
Cooldown: 2 topics.
Description: 
Usage of this ability is done by focusing on the Pact Mark (The Guild Tattoo), which is augmented to appear more a skull with a ribbon of runes twisting out from its mouth and wrapping around and out from it forming a Celtic knot like pattern.  Tight runes form in rows along the users body when performed by an ace. In doing so drawing out primordial knowledge in a form of pure understanding without language.   Channeling this information you utter a word so profane that nature itself seems to recoil.  Clouds in the sky eject themselves from the location as though being rushed away (Similar to when you put pepper in a bowl of water and then with dish soap on your finger poke the middle).   Birds and animal life all flee from the area and every intelligent being feels a deep shudder run through them and a coldness takes hold.    Warmth flees the land and light dies.   The sun turns red in the sky,  casting only dim crimson light on the land.

When Grim Blasphemy is used all access to higher powers is cut off.   This negates and prevents the use of all Guild Spells,  or Event powers that are not something a character could normally do.   All unholy beings become immune to effects that specifically target or have advantage against them.  (Immune to targeting,  but just immune to the advantage if it doesn't specifically target the unholy). 

Any immortal being can be slain as though mortal while Grim Blasphemy is in effect, baring in mind that PCs still require permission to kill.   Such beings would feel this weakness,  feel the mortality gripping them.  Whether they despair or not is up to the individual but it may well certainly be unexpected. 

Strengths: 
• Prevents Guild Spells and similar effects.
• "Immortals" baring a Pact Mark, or the source of it, are spared the mortality. 
Weaknesses: 
• Prevents all allied Guild Spells as well.
• X-rank individuals can still use X-rank spells. 
• PC's are still Plot-Immortal, requiring permission to kill all the same. 
• This spell is incredibly obvious when used and all will be alerted to its presence,  though they may not know what it is exactly only that something has happened. 

Name: Grim Dawn
Rank: H+
Type: Support
Duration: Topic
Cooldown: 2 topics
Description: 
Focusing on the Pact Mark,  which is augmented to appear to more skull-like,  horned,  and demonic with a halo of runes backing it.  Viscous rough claw-like bands of runes crawl out across the user's body when performed by an ace.  The user channels the Pact's power to reach out and touch all those others with the mark of the pact.    The user and all the others with the pact twitch as every bone in their bodies break off to one side moments before exploding in a shower of gore.  

From their places are burning gates from which they emerge in a new body,  a demonic body.  A monstrous body.  Members choose their own monstrous appearance and can make one user-ranked (Up to S) signature spell,  or two Non-signature spells,  and one passive (Or forgoe the spell(s) to gain another passive) all usable only when Grim Dawn is active.

This new body doubles their max HP and heals them to full, so if they had 100hp max they now have 200hp.   They gain +200% in total that they can allocate themselves to Strength, Speed, Evasion/Reflexes,  Mana,  or more HP.    This can also become regeneration for 25% per 2% regen, up to normal maximums.   No more than 100% can be spent on a single stat.    For every 20% debuff they choose to add,  they can add an additional 10% buff that can go beyond the +100%. 

Strengths: 
• Makes all guild members ascend into a monstrous form,  granting a bit of extra power. 
• Ends any ongoing effects on the effected.  Such as any damage over time,  curses,  debuffs, and so on. 
Weaknesses: 
• A very obvious effect, there is a clear change and the monstrous forms are very likely to draw attention and alert potential enemies. 
• Ends any positive ongoing effects as well,  such as any heals-over-time,  shields,  or requips.  Does not end takeovers though, since takeovers are the focus of a takeover magic and it would be pretty unfair for them.
• Forms must be made ahead of time and are always the same.  No making something up on the spot just to counter a specific enemy, made as a Pet app and posted in the pet section separate from other apps,  and put up for approval.    If no such app is made,  their appearance can still change but they do not gain a passive or spell,  and gain a flat +50% to all stats. 

Name: Grim Reaping
Rank: H+
Type: Offense
Duration: 10
Cooldown: 2 topics
Description: 
Focusing on the Pact-mark, which is augmented to look more like a skull that has been pierced by two crescent blades that come in from the eyes and curve out the mouth and highlighted by runes that drip from its sockets and jaw.   Smooth crescent bands of runes crawl out across the user's body when performed by an ace.     

When used this spell creates a huge scything motion out from the user that then cleaves the sky in two directly vertical to the caster, forming a clear divide in the sky.   That divide splits apart like a great fissure.   It is lit by flames and drips lava from the stony sides that are melting away inside of the crack,  fires highlighting the edges in the sky.   

From the crack above two colossal skeleton hands reach through,  grabbing the edges of the fissure and widening it.   Within,  a massive burning eye can be seen as some deific entity of bone and flame tries to rip its way into the world.   After one post,  the fissure is wide enough both eyes can be seen like dim suns in the sky,  all other light gone (No stars, moon, or sun visible,  and the land dimly lit).   It moves,  a boney grin filling the view through the fissure as its jaw opens,  and a suction fan be felt on all as the being tugs on the raw life force of all individuals in the area, dealing S-rank damage per post to all.  This is pure essence of death and will heal undead while damaging the living.  Those with a pact mark but not undead are not effected either way.

If they die to this effect,  their pure essence and soul get stolen away,  consumed by the being behind the fissure.   Their souls locked in purgatory.   This leaves behind empty bodies that become soulless husks that serve Grim Heresy without emotion,  memories remaining but distant, like reading a boring book about a stranger.

Strengths: 
• A pure damage spell that will kill most things quite handedly over time.
Weaknesses: 
• The damage is less up front and relies on the reoccurring damage.  Some things can intervene ending the reoccurring damage early one way or another on individuals. 
• PCs can BS an escape clause of some sort so their soul is not locked in Purgatory,  or is but they resurrect somehow as normal without their soul or something.  Either leaving their previous body as the husk or somehow reclaiming it,  or not becoming a husk in the first place.

WARNING:  Flying up into the fissure itself results in near-instant death (Taking H-ranks worth of damage per second within 300 meters of the fissure,  doubling per 100 meters closer).  Don't do it.  Most effects shouldn't be able to reach it in the first place.   But it's supposed to be more of a cosmetic effect, in the upper atmosphere. 
This isn't an intended effect but a hazard to note in case someone tries. 
For safety reasons,  teleportation or portal effects would be broken if they attempt to get with a mile of the fissure (Which as mentioned is in the upper atmosphere),  and individuals flying/traveling somehow feel more and more sluggish, and increasingly more filled with fear the closer they get,  pushing them to not approach.

Name: The Ash Wights
Rank: Guild
Species: Undead
Type: Guild Pet (Defensive)
Description:

The Ash Wights are a collection of burning undead skeletons who's bodies are heavily composed of molten plating,  blackened cooled lava and charcoal form an armor-like coating around their black bones, warm from the fires that burn internally.
The Ash Wights are silent wardens that serve to protect the guild and the guilds assets.  They can be found in important areas throughout the guild hall and guild safe houses out in the world.  They are somewhat slow when in full physical form,  but are capable of moving more speedily by deconstructing themselves and manifesting elsewhere. 
Ash Wights hunger for flesh and if not given commands will seek out the living,  attempting to box them in with molten walls and pursue them until they give up or otherwise cannot escape them to slowly burn them alive while consuming them. 
Members can call the Ash Wights for aid.   2 Ash Wights can appear per rank of the guild member. 


Abilities:
Innate:
Undead: Ash Wights are undead.  They do not fatigue and do not sleep.  They wont die of starvation though they desire flesh and can hunger.  They are immune to "Critical hits" meaning all damage is just damage with no special benefit to where or how they are hit. 
Guardians:  Ash Wights have reduced physical offense and speed in favor of defense.
Pursuit Predation: Ash Wights are always aware of the location of an Ex-Guild Member for the first 24 hours,  then if within 5 miles after that,  and always know the general direction of where they last sensed them.  They can sense anyone with a Pact Mark or Blazing Hand print from anywhere, and can lead guild members on a hunt.  Enemies they have seen can be hunted similar to Ex-Guild members past 24 hours (Within 5 miles + general direction last sensed).
For plot reasons anyone who's blood comes in contact with an Ash Wight or an Ash Wight physically touches can be considered to have a Blazing Hand print for the purpose of predation.   This doesn't have to always be a factor but it can crop up if desired for a topic.  The victim in question having to be wary of Ash Wights hunting them and so on.  Could make for a fun theme and stuff. 

80hp.  33% damage resistance.  10 basic damage.  They move at 1mph unless moving in ash form. 
Less Ash Wights can be called,  increasing HP by +50, basic damage by +3, and damage resistance by +3 for each Ash Wight rejected for the individual Ash Wights.  (Instead of 2, 1.  Instead of 4, 2,  or 1,  and so on.)

Spoiler:

Spoiler:

Spoiler:

I fully intend to acquire other bonuses and various things for guildmembers.   Some of which I'm not mentioning because it would be nifty to be the first guild to benefit!  Muahahahaa!