Helm

Helms are one of the seven slots for armor. Their primary use is protecting your head and cranium, especially against Mind Flayers. The most popular helms to carry are Helm of Telepathy, Helm of Brilliance, and Elven Leather Helm. Cornuthaums are occasionally used by wizards, and Helms of Opposite Alignment are often used on the Ascension run. The Helm of Telepathy grants extrinsic telepathy, similar to an amulet of ESP. HoB will increase your Int and Wis by it's enchantment, so +5 HoB and 18 Int and 17 Wis will produce 23 Int and 22 Wis. Elven Leather helms simply weigh less than most other helms; 3 wt versus 50.