The original Fusion Spells, where the protagonist uses a stylish attack combining two of his Personas, are back in Persona 3 Reload as his Theurgy. These are some of the most powerful attacks in the game, and here’s a full list of all of them.
All Protagonist Theurgies in Persona 3 Reload, Listed (P3R)
While each party member gets access to up to two Theurgies, the Protagonist has various of them representing some of the Fusion Spells present in previous versions of the game. Different from other versions, all you need to use them in Reload is to have obtained both Personas at some point and a full Theurgy gauge.