Persona 3 Reload - Theurgy | Part 10
When we enter Tartarus, we go through a pretty heavily scripted section that leads to a fight with just the MC and Yukari. Yukari activates her Theurgy in the fight, and from then on everyone else can use theirs too. Theurgy is basically this game's version of Showtimes from Persona 5 Royal. Except they're more controlled about when you use them instead of just triggering semi-randomly. In this, you build up Theurgy by taking actions, or build it up faster by doing specific actions that specific characters like. Then you unleash an attack that ignores elemental resistance.
The protag gets multiple of these, effectively replacing the cross-persona skills the original P3 had. And now you don't even need to have the right Personas in your party, just have to have gotten them at some point. You start with Orpheus's one, Cadenza, which heals 50% HP and raises Hit/Avoid, but you'll likely already have Jack Frost/Pyro Jack's unlocked, which deals Almighty damage to all enemies and has a high chance to knock them down. Pretty good standard attack to have as a reliable option.

