Once Jay masters various compatible base eres, these eres can be compounded together to create new attacks that can be used to knock down the targetted enemy and other nearby enemies caught within range. Most compound eres receive a boost to damage when used against specific classes of enemies, but all compound eres can be used against any enemy. All of Jay's compound eres work as melee knockdown attacks. Each eres must be mastered (used 50+ times) to become available during the compounding process. Only one compound eres can be created at any given time per character.