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The large 'rock' in Shyllien
Fragment of a discussion from Talk:Shyllien Ecology
I've seen this happen in several instances. Spawn count lowers if no one is around. If someone starts killing, an increase in spawn occurs. Ancients appear from lingering mobs, so likely they've been sitting around for a while.
If you go to Hillwen and gather in one of the unguarded deposits, they will spawn shortly after gathering a bit.