One of Ventdal's greatest hexes, spirit shackles, curses the victim to deal damage partially on the spiritual plane. Before mastery of that spell, however, comes a certain amount of training for afflicting oneself with the same energies. As witches of Ventdal grow toward mastery, they learn to channel a portion of injuries taken to their spirit instead, should their mystical energies be sufficient.
Up to 20% of damage + 1% per 10 myst will go to mana before health.
This occurs before many damage taken modifiers such as resistances, so the damage to mana will be outsized.