.. so maybe it was a eerie biome ( from the perspective killing Pechs not a good idea ... i will make some more ) , since i have a eerie biome multi level mod farm ?They spawn in magical biomes, and that isn't excusive to thaumcraft's own biomes. Ominous Woods and Flower Fields come to mind. It's also possible they wondered out of the magical biome. (Eeriee Biomes are naturally spawned in Regrowth, and perhaps tainted lands).