Go, Onyx

Name: Dracolich Titan; The skeleton wyrm
Rank: Legendary (xUser)
Species: Undead skeleton
Type: Combat
Description:
This replaces Siren's past High Serpent Body (along with significant nerfing).  Which was an eventy rewardy sort of thing that I don't feel comfortable using anymore. (-I meant that just more as a because it was heavily tied to her ocean demon slaying in addition to it having been hugely overpowered with new rules made since it was made.   Now, however,  I'm now replacing "Stone serpent body" that originally replaced High Serpent, because that was tied to Earth demon slaying.)
This also, naturally, replaces her ability to use a pet.  As this uses its slot.
[9:21:28 AM] Zack Rose: eh  any mod can approve it [9:22:04 AM] Zack Rose: but tell them if they need help with it to PM me

http://wiki.konami-castlevania.com/enemies/dracolich-titan/
https://youtu.be/pujqPKmtSwg

The Dracolich Titan form is 70 meters long and 10-15ish meters thick in it's default state.   It appears as a colossal wyrm,  not a traditional dragon but an ancient predecessor that similar to dragons in the way that Lilith was similar to Eve.  The wyrm has no dragon nature left,  it only lends itself to a vague dragon-like appearance.  Rather,  it is more of a demon.  This in particular being undead.

Across its long body billows out smoke and ash,  with sparks and embers of flame flickering throughout the cloud,  faces roiling within.  Some faces looking tortured,  others looking blank,  some looking pleased and sinister.  This smoke varies,  it can be almost like steam off a hot body fresh out of a shower or it can envelop it like a cloud of blackness flickering with flames.   When it roars or even speaks,  the sound of thousands echo behind it,  like a legion speaks all at once or as though hundreds of demons howl in unison with it.

Working with her nature as a Titan size crossing with the Dracolich's size, the default size given is scaled proportionately to her humanoid body would be with the new default scales.  The benefit of the titan size is doubled as a result to compensate slightly for how easy it would be for most things to hit her and how big of a target she would be for practically any legal mage who witnesses.

The wyrm isn't a separate creature,  but is Eris herself shedding all pretense of humanity and assuming her highest form,  her that of a demonic body.  She's just as intelligent as before,  but any shred of restraint is lost.   Where before she might let someone live,  or try to play games with them, let them live. Manipulate.   It is all lost in favor of the more overt side of chaos.

To assume the shape, Eris's body seems to invert inside out as her body grows and expands,  Snapping and cracking with bone bursting from her undead flesh,   elongating more and more as it widens and forms in the course of but a few seconds, bones and corpses from the environment flying to connect with it just for effect to merge into the creation.


Abilities: 
Being that it replaces the pet,  user gains the HP and physical values of the appropriate pet slot when assuming this form, but only 25% of it when not in the form.

-Lord(ess) of the Dead- The presence of the dracolich seizes command of the dead.   Undead creatures below A-rank get overwhelmed by the will of this ancient necromancer.   When the full form is unveiled,  it becomes A-rank or less (Rather than below A).  PC's are directly/themselves immune.    Undead creatures who over-rank or are PC summons are instead shaken by a conflict of will.  Their speed is reduced by 50% +15% per rank lower than A,  -10% per rank greater than A, including their attack/casting speed limiting their actions and due to their active resistance are not treated as undead for beneficial effects of Eris's necromancy.
This is in effect regardless of her size or appearance,  but while in the full skeleton-wyrm mode the speed/attack reduction effects all non-undead as well that are as close to it as it is long (Varies on size, which is variable due to titan nature).   Horror exposure from her necromancy is boosted by an extra 2.5% per 5% on effected individuals.
Creatures/Beings that attempt to flee are not effected by the speed reduction specifically, if anything they probably gain a +15% increase to their speed for the purpose of fleeing due to fear.


-Damned Merger- The dracolich can merge with an active summoned creature.  The values of both the summon and the dracolich are merged into a single entity.  The size and nature of the dracolich fuse into the summon forming a creature that looks more like the summon and less like the dracolich,  but still clearly being a combination of both.  Highly variable with the nature of the summon/minions used,  and with whether or not the dracolich is in humanoid or full wyrm appearance in addition to whether or not she is manifesting titan sizes
The only real actual benefit from this is the summon no longer takes up a summon slot, but at the cost of the two being one sacrificing independence.  Any cost keeping the summon active or any duration remaining persists,  and once ends or gets too much the merger breaks.  If she runs out of MP the merger breaks.  If she gets KO'd the merger breaks.
She could freely merge with lesser undead minions of hers with this ability, providing her with a varied appearance potential.