From the forums: GSE saves the BASE SPELL for an ability. This started in BFA or Legion (I cant remember which) where Talents and Procs would change an ability (very temporarily for procs, more permanently for talents) into an updated version. The simplest of these examples ins Paladin’s Avenging Wrath and the talent Crusade. If you put ‘/cast Avenging Wrath’ into a macro and had the talent for Crusade it would cast Crusade. If however, you had ‘/cast Crusade’ and no longer had the talent, your macro would never cast Avenging Wrath. While this worked - underneath the covers I had a list, and was checking it twice to determine which spells replaced which. As it was manual it missed some and in a few cases had the wrong combination. In working through Shadowlands changes I found Blizzards function to get the base spell from any ability. What we didn’t know then but know now is that Spec changes change a base spell into a spec specific variant. For Priests, Flash Heal becomes Shadow Mend when you swap to shadow. You found the relationship between Eviserate and Displatch. What this also means is that we can write a macro to work across specs now. Whether you would want to do that or not is another matter.