Fire Elemental

Fight! [1]
Enemies gain the Fire Form (5 fire damage) trait.
Fire Form
A creature that touches the creature or hits it
with a melee attack while within 5 feet of it
takes damage. In addition, the creature can
enter a hostile creature's space and stop there.
The first time it enters a creature's space and
at the start of that creatures turn that creature
takes damage; until someone douses the flame.