Burst Into Flames

You transform a willing creature within range, along with everything it's wearing and carrying, into a roaring wisp of flames. The spell ends if the creature drops to 0 hit points. An incorporeal creature isn't affected. If you concentrate on this spell for the Duration then the effects last until dispelled.

While in this form, the target's only method of movement is a flying speed of 30 feet. The target can enter and occupy the space of another creature, any creature caught within this space must make a Dexterity Saving Throw or take 1d6 fire damage as the targets flaming visage passes over them. The target has resistance to nonmagical damage,immunity to fire damage, and it has advantage on Strength, Dexterity, and Constitution saving throws. The target can pass through small holes, narrow openings, and even mere cracks, though it treats liquids as though they were solid surfaces and takes 1d6 cold damage upon contact with water. The target can't fall and remains hovering in the air even when stunned or otherwise incapacitated.

While in the form of a stroke of fire, the target can't talk or manipulate objects, and any objects it was carrying or holding can't be dropped, used, or otherwise interacted with. The target can't attack or cast spells.