Clarity
Clarity is an intrinsic which protects you from confusion, being misled or mesmerized (except when the source is the Obsidian Axe), and from going berserk unwillingly. Its power is limited, however, and it cannot protect you from confusion inflicted by Xom, or the wrath of any other god. It also does not prevent you from willingly going berserk, such as via potion of berserk rage or Trog. Clarity shields you from the confusion and damage effects of Mephitic Cloud.
You can acquire it from the following sources:
- Amulet of clarity
- Randart amulets that have the clarity ego
- The Autumn katana unrandart
- Clarity mutation
- Ashenzari grants it at *** piety
Strategy
Avoiding confusion is critical in certain portions of the game. Confusion caused by enemies like golden eyes and swamp drakes can be extremely fatal if it hits at the wrong time; it may be worth avoiding branches they can be found in until you find a source of clarity.