Black Swan Storm (High Elven Magic)

Call forth a whirlwind of black feathers that fill a 5-foot cube within range.feathers deal 2d8 force damage to creatures in area of effect and radiate darkness, causing illumination level within 20-feet of the cube to drop by one step (bright to dim and dim light to darkness) creatures must make a Dexterity saving throw on save take half damage but still affected by lighting effects

at higher levels. When you cast this spell at 3rd level or higher the feathers deal an additional d8 force damage per spell level