[Ardratz]

So when multiple ghosts are in a party the first one to attack an enemy inflicts Claret Call and no other Ghost can. They can power up this Claret Call for the first ghost but it will only be used by the first Ghost who attacked this specific enemy powering up their physical damage and being used for skills like Ether Invitation and Reaper Scythe.

Considering Claret Call used to have multiple instances each one being attributed to the specific player who inflited it I feel that this is indeed a bug.