Sadly, very sadly that the gained amount of health should be healed spending time and mana for that, while being attacking. It was one of the main WP skills even when you nerfed it in the previous update.
This skill didn’t heal you, it just gave you the amount of health regarding skill level which is supposed to be, like the armor skill gives armor. Healing with 6 level spell gives you even more health, but this skill is a buff (half of a baff right now)
Now it became more useful. And WP with it’s small skill damage with 2H Weapon compared with 1H +1H (see related topic) became more unplaylable nerfed skass.
Closing this topic, but still hoping you will make game mechanics more balanced and redesign these buffs (make this and armor buff at max level 3 minutes duration with 3 minutes cd (or 5 like potions with 5 minutes cd) with restoring health for gained amount like it was before) or change Blessing of Fortitude to another more useful buff.