maybe you should make the effect just do -500 damage, rather than "spell damage".
i'm a bit rusty (it's been months) but tweak that damage effect. If it's doing "something", then the problem isn't getting it to do it but rather what it's doing. try other effect parameters if you can. i forgot if there's a simple "add life" effect rather than a negative damage number, but just try something other than spell damage, like a basic damage effect.
also make sure the parameter for the effect isn't a percentile parameter and that it's a clear cut damage parameter (rather than -500 damage it does -500% or maybe -0.05%.
i think you can simply remove the upgrade in data. it's probably set to be pre purchased. also you should clear any behaviors or abilities that match that name from the unit, to make sure it's not showing up when it's already there. sorry if this isn't specific, but i haven't looked into that mod yet
hey, i need some help. remember in special forces: elite how all players gained money from one players kills? here's what i need: a trigger that gives all players the same income (in this case from killing units with specific kill resources) but does not allow shared spending or control.