Shadow Cloak

Type: Element (Essence); [negative][protection]
Power Rank: 5
Range: Caster
Duration: Concentration
Area of Effect: 1 Target
Activation Time: Move
Defense: Special
You  cause shadows to begin to wreathe around our body until you end the  spell.  This grants you a 50% concealment bonus and turns all light  around within 10' into darkness.  During this time the spell grants you  invulnerability to damage from electrical, light, or positive energy  sources.  Additionally, whenever you are hit with a melee attack, the  cloak lashes out with tendrils up to 20' in length to strike at  targets.  This attack has a 100 Skill Score and deals 8 points of  necrotic damage per success.