Talk:The Stolen Grimoire/@comment-64.180.172.205-20150804223637/@comment-3204627-20150805011935

they have the rewards shown as the question mark on the bottom left of the entry tag before entering. The boss is rediculously hard if you're relatively new in area 5 because it's a high damage dealer and critter. I don't recommend exhausting resources on it if your infrastructures (buildings) are still low levels; it's better invested on those early so you have a more comfortable mid and late game.