These are essentially abilities that don't count for the slots that were introduced recently.
Now a necessary point has to be raised.
These 'abilities' they get need to be defined. Perhaps there is some leeway with a few of them as to how a member wants them to work, but the basis should be defined I think.
Katherine has already suggested resistance amounts in a seperate thread, but other parts needs to be assessed and ruled on.
Slayer physical buffs: We know slayers get physical buffs. These are generally to strength, endurance and stamina plus speed on occasion. Now, I feel that we need a standard for this otherwise people are going to go either be too general and say 'boosted strength'. I feel if we create a base line of say a 20% buff in each of the four areas I mentioned and then they can trade percentages to other areas e.g. 15% endurance, 15% strength, 30% speed, 20% stamina.
Slayer senses: We all know slayers have a keen sense of smell, but how keen. Is this rank dependant like the sensory skill? Do they get other sensory enhancements (For example i've got Zack with a sight enhancement)
Slayer resistances: See Katherine's thread for this.
Force: Force is pretty well defined, but I think probably needs one slight adjustment. We have I think a rule saying the mage must eat 25% of their element every post for five posts or something of that nature. However, we don't define how much they would need to consume if for example they wanted to go into force in two posts.
Perhaps if we establish a base line of if you want to enter force you need to eat 80% in one post then the total gets 10% amount added to it per post that you split it up into. So for two posts its a total of 90%, so 45% per post for two posts or...two posts that total up to 90% so 40% and 50% for example.
So for 5 posts it would be 120% or 24% per post for 5 posts or just enough each post to total 120% in 5 posts.
A bit of maths required, but...it would make things more defined. As we've seen in canon natsu go dragonforce in a few seconds.
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Now comes the second bit.
Secondary slayer magic.
Do these ALSo get the same abilities and if so are they the same strength, weaker?
If they have primary and secondary slayer do they get to stack these abilities thus making third gen more powerful?
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Third bit:
Does slayer type matter? Do demon and god have better buffs than dragon? Do they also get a resistance to holy/unholy?