Effrit's Heart

Unsheathed it gives off bright light for 20 feet
When Heat Metal is active gain the following properties: Burn's brightly 120 feet
Add 3d8 fire damage to your damage rolls.
Creatures take 1d4 fire damage when entering
within 10 feet of the sword for the first time
on a turn or starts its turn there.
On a critical hit the heat causes an ablation effect
if the target is a large or smaller
creature move 10 feet away and knock it prone