"Monster Raid" :O

I remember when someone was talking about the monsterbook and how higher lvl people wouldn't be able to get the PQ boss cards, someone said something about an event in KMS that let people face them again to get the cards (not the fake bosses). Perhaps this is it.

That would make some sense, but quiet a few of those monsters are open to the public. Crimson Rog, the new-bosses, ect. o.0 Only the King Slime, Alisher, and a few others are PQ Bosses.