Normaly self inflicted penalties from items like Cheat Death and Fury Trance can't be avoided using debuff remover, divine barrier or unstoppable.
However since only the -70% damage penalty from Cheat Death can be avoided with Unstoppable while the movement penalty is still applied properly I...
Both items provide base spirit resist and contain a passive that applies additional resistence.
With Spirit Resilience the base is 30% and the passive 30% resulting in a total of 60% resistence.
With Frenzy the base is 10% and the passive 30%, which should result in a total of 40% resistence but...
I must admit I didn't actually know about this. After spending some time testing it I like how it interacts with healbane and would like to change my suggestion to a T4 upgrade to healingbooster that further helps it in the lategame when enemies can stack toxic bullets, leeach and decay...
Since unstoppable no longer affects anti-heal and I really enjoyed that synergy for Wardens ult I think it is possible to balance this ability as a seperate item.
Be it a T4 upgrade for debuff remover or it's own T4 item.