Undead champion lvl 19 hero's defiance.

[Keciak]

Hi all,

I'm currently playing an undead champion and on lvl 19 I receive the hero defiance focus spell which I can use to heal myself from a sticky situation. The problem is this healing has healing and vitality traits, therefore a very powerful class feature becomes useless. Is ther any errata that corrects it or should I ask my GM to homebrew it?