Also: Arcane Ammunition, Blade Coatings, Combat Runes.
When you successfully hit one or more targets with an attack, you may spend 2 Inventory Points to produce a special infusion and apply the corresponding effect to that attack (if the attack had the multi property, apply the effects of the infusion to each target).
You cannot apply more than one infusion to the same attack; producing and using an infusion are both part of the action you used to attack with the weapon.
Choose one option: you recover an amount of HP equal to half the HP loss suffered by the target of the attack; or you recover an amount of MP equal to half the HP loss suffered by the target of the attack.
This infusion can only be used if the attack targeted a single creature.