The Iron Helm 'Holhenneth' [5,+10]
+2 intelligence, wisdom. +10% to searching. Provides resistance to blindness, confusion. Cannot be harmed by acid, electricity, fire, cold. Grants the ability to see invisible things.
When activated, it detects treasure, traps, doors, stairs, and all creatur es nearby. Takes 56 to 110 turns to recharge.
Min Level 20, Max Level 100, Generation chance 20, 7.5 lbs

(Angband 3.1.2v2)