User:Guy/Splat/Spells/Voidwave

Voidwave

4-point necromancy (necrotic)
Casting time:	action
Range:	self (15-foot cone or 5-foot radius)
Components:	V, S
Duration:	concentration, up to 1 minute

An black wave of inky miasma gushes out from you in either a 15-foot cone, or in a 5-foot radius in every direction, as you decide. Each creature other than you in this area must succeed on a Constitution saving throw or take 2d10 necrotic damage and become blinded for the duration. On a successful save, a creature takes half as much damage and instead of being blinded only suffers disadvantage on ranged attack rolls and Wisdom (Perception) checks for the duration.
 An affected creature can use an action to attempt to clear its vision, allowing it to repeat the saving throw. On a success, the effect ends on that creature.
 Exhausting Spell. Once you cast this spell, you can't cast it again nor cast any other exhausting spell until you finish a rest.