Exploration Mastery is a ritual feat available to adventurers with the Ritual Caster feat, and who mastered Endure Elements and one other . The feat was introduced in the article Heroic Tier Rituals.[Dr405] The adventurer with this feat may substitute an arcana check, nature check or religion check in place of an endurance check. Once per day, the ritual caster with this feat can ignore the component cost of an exploration ritual of their level or lower that they have mastered.