Maybe you can add something like metal skin for spirit damage? If enemy team has plenty of spirit dps, you don't really have ways to resist. I'm sure it's base for every player have 80-90% of spirit damage after death.
Gain 5 Stacks that grant 8% Spirit Resist Each. When you take an instance of Spirit Damage that exceeds 125, Lose a Stack and gain 65 Spirit Shield Health.