Burning Grasp

Bright crackling flames and writhing embers wreath your hand and leap out to deliver a sizzling burn to a creature you try to touch. Make a melee spell attack against the target.  On
a hit, the target takes 1d10 points of fire damage, and they take additional fire damage equal to your spellcasting modifier at the start of each of their turns until they spend a bonus action to extinguish the flame. A flammable object hit by this spell ignites if it isn't being worn or carried.

The spell's damage increases by 1d10 when you reach 5th level (2d10), 11th level (3d10), and 17th level (4d10).