Dathnar's Red Claw

You summon forces from the elemental plane of fire shaping it into a spectral claw. Once per turn you can make a melee spell attack against one creature in range, +5 to hit, Hit: 13 (3d8) fire damage and the target must make a DC 15 Constitution saving throw or be engulfed in flame for the duration. While the target is engulfed in flame they take 1d6 fire damage at the start of each of their turns. The target may repeat the save at the end of each of its turn.