So I just got done fighting in the tavern and faced off against 2 griffins and other creatures. Mostly unnoteworthy. However 3 had artifacts with pandemonium rebirth. While one is no big deal 3 isnt supposed to be. In the description they said if more than one instance of the ability is on a team then it isnt supposed to activate.
Oh trust me it did. The team was completely unkillable as killing all or any of the three just revived all of the others for free.