Helm of Heroes

Alter: You gain a +1 bonus to AC if you're wearing this helmet and no other armor, though you can use a shield and still get this benefit. In addition, while wearing no armor, the helm becomes suffused with glory and glimmers for 1 minute whenever you roll a 20 on an attack roll. While the helm is glimmering in this way, you gain temporary HP at the start of each of your turns equal to half your level, and friendly creatures within 10 feet of you can't be frightened.

Attunement: yes
Rarity: Rare
Type: Helmet
Cost: 4455gp

Griffons Saddlebag, Vol 1