[insert flavor text here]
When activated, this mask grants you the following benefits:
Haste, expeditious retreat and for every 8 damage you deal in melee combat you gain 1 temporary HP.
However, you also take 1 additional damage for every 5 damage you take.
This effect lasts 10 rounds, and is usable 4 times a day; although no more then once per hour.
Cost: ??? Spells: Haste, expeditious retreat, vampiric touch.
Thoughts? Cost estimation?