Khalim's Brain


 * "This is most fortunate... Khalim's Brain knows Mephisto's weakness." - Deckard Cain

Khalim's Brain is one of the items needed to create the flail, as part of the  quest.

It can be found on level 3 of the Flayer Dungeon (not to be confused with the Swampy Pit, which is also in the Flayer Jungle).