Dante's Inferno

Relics are accessories you can equip, granting you additional stats. Holy/Unholy ones require you to reach a certain level in the respective tree to equip them, while others are unaligned and can be equipped right off the bat. You can wear up two relics, increased by another two if you acquired the extra relic slot skill in both trees. Collecting souls while wearing them will increase their stats and level to a maximum of three. Refer to the relic itself to view the increments. You can find a location guide to all 31 relics here.