Toughness

Toughness (enhancement)
The Toughness feat unlocks the Racial Toughness enhancements in up to four tiers. Tier I and II are available to all races; III is available only to Humans, Dwarves, and Warforged; and IV is available only to Dwarves and Warforged. Each enhancement tier adds 10 hit points to the character's total.

The Toughness feat also unlocks class-based toughness enhancements tier I-IV, available only to Barbarians, Druids, Favored Souls, Fighters, and Paladins. Each enhancement tier adds 10 hit points to the character's total.