Yamu's Burning Touch

You touch a creature and imbue its flesh, bones or whatever else you can get your hands on with magic, causing it to ignite.

The target must succeed on a Constitution Saving Throw or take 2d6 points of fire damage. It is then lit on fire and takes an additional 1d4 points of fire damage at the start of each of its turns for a number of rounds equal to your proficiency bonus.

On a successful save, the target only takes half of the initial damage and is not lit on fire. The target or another creature can also take an action to extinguish the fire.