Incandescent Sword

Weapon (longsword), very rare (requires attunement)

You have a +1 bonus to attack and damage rolls made with this magic weapon. When you hit a creature with it, the creature takes an extra 2d8 fire damage.

Flaming Sanctum (Requires Attunement). You can plunge the weapon into a soft surface to activate its magical protection.

While the weapon is stuck in the surface, the area within 10 feet of the sword becomes a flaming sanctum. Neither the flaming sanctum nor its contents can be targeted by divination magic. Any attempt to perceive the area through magical scrying sensors burns the perceiver, dealing 2d8 fire damage, and fails automatically. Additionally, the creature trying to perceive the area must succeed on a DC 14 Wisdom saving throw or be charmed by the flames. The creature repeats its saving throw at the end of each of its turns, ending the effect on a success, or taking 2d8 fire damage on a failure. A creature charmed in this way keeps trying to perceive the area until the charmed condition ends.