The Vault Hunter's Relic in Borderlands 2

Relics in Borderlands 2 are rare items that grant bonuses in all sorts of areas, such as speeding up your Action Skill, adding Elemental damage to your attacks, or making your Vehicle go faster. You never know how a Relic will change your game.

For example:

Elemental Relic

Proficiency Relic

Vault Hunter's Relic