Amulet of Ka

The amulet of Ka is a bronze amulet with a centered setting of a smoke colored crystal. The crystal changes colors and houses spell effects when absorbed. 

Notes: Bonus: Hit Points, When targeted by a spell, and the saving throw is failed or the spell attack hits the wearer, you can use your reaction to absorb the spells energy, gaining temporary hit points equal to the spell level plus your charisma modifier., Wearing