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At least your not taking damage like everyone else. Just wait it out. Others risk dieing from it.
Yes, but when levelling, any NPC one would intentionally fight is going to be of higher level, and thus capable of poisoning griffons. No one wants to just sit around gaining health at a few percent per tick. So griffons will need healer support to regularly fight such NPCs.
I can understand making griffons vulnerable to gas attacks to help balance the CRS. I don't see why griffons need to be debilitated by the poison status effect, and checking their immunity before the effect disturbs their rest would effectively solve this.