This isn't perfect but it's a lot closer and the same sort of concept can be used for other spells of similar wording. In the latest update of BCE I added DUR for you PF1 people. I think it might be really useful for something like this
Code:AURA: 15 enemy; Spirit Add; IF: FACTION(notself); DUR: 1; TURNRS; IF: CUSTOM(Spirit Guardians); SAVEA: [SDC] WIS (H); SAVEDMG: 3d8 radiant; DUSE
Code:AURA: 15 enemy; Spirit Guardians; IF: FACTION(notself); IF: CUSTOM(Spirt Add); SAVES: [SDC] WIS (H); SAVEDMG: 3d8 radiant; (C)

