Reese is the leader of a group of Zamorakian cultists encountered during the free-to-play quest The Blood Pact. Reese, a former Acolyte of the Lumbridge Church, together with two other Zamorakians, Kayle and Caitlin, formed a blood pact. The pact binds the three to their mission of sacrificing Ilona, an innocent wizard from the Wizards' Tower, in order to harness the power of Dragith Nurn; a long-dead necromancer buried in the Lumbridge Catacombs. They hope to claim his body and raise an army of undead to overrun the town. Reese is the third cultist met by the player during the quest and must be defeated in order to free Ilona.
He uses melee to attack, using the Slaughter ability when he reaches 50% adrenaline and once dead, the player can obtain his swords. If the swords are lost at any point, another may be claimed from Xenia after the quest. If the player tries to spare Reese after the fight, he drinks poison and commits suicide, completing the ritual and opening the catacombs dungeon below the church.
He cannot follow the player past the tomb door, so it is easy to escape him if in danger. This also causes him to stop being aggressive and only attack the player in retaliation.