Elemental Sword of Fire

Weapon

Rare

Flaming Mark: When landing a melee strike, the target must make a DC-12 Constitution save or be set on fire for 2 rounds. Each round after the initial strike, they take 1D6 fire damage.
Aura of Heat: As a bonus action, you can activate or deactive the Aura of Heat. The aura affects a 10ft radius around you. Any creature that starts its turn within the radius must make a DC-13 Constitution save or take 1D4 fire damage. They take an extra D4 of damage if they are wearing any metal armor. You can choose up to 5 other creatures to be immune to the aura.

The Elemental Sword of Fire is a longsword whose blade seems to always be glowing red. Despite its near-molten appearance, it still has an edge as sharp as any finely crafted sword. Those who take direct blows from this sword will find said chunk of their body to be combusted with a strong fire.