The Iron Helm 'Holhenneth' [5,+10]
A large helmet that can protect the entire head. Ventilation and bad
vision can be a problem, however.
A famous helm of forged iron granting extraordinary powers of mind and
It can be activated for detection every 55+d55 turns if it is being
worn. It increases your intelligence, wisdom and searching by 2. It
provides resistance to blindness. It allows you to see invisible
monsters. It cannot be harmed by acid, cold, lightning or fire.
Level 20, Rarity 5, 7.5 lbs, 100000 Gold

(T.o.M.E. 2.3.5)