Shining Sword of Flame

Weapon (longsword), artifact (requires attunement)

A gift from the Sultan, this weapon was specially constructed in the forges and factories of the City of Brass. It is exquisite in design, the blade forged of living brass. The hilt is wrapped in the blackened skin of a slain demon lord. When you use this weapon, you gain a +4 bonus to hit and to damage.

• As a bonus action, you can choose to charge the weapon with your choice of fire, lightning, thunder, or cold damage. The first hit after the weapon is charged does an additional 3d10 damage of that type. The weapon does an additional 2d10 radiant damage against any chaotic creature that it strikes.
• You gain advantage on attack against a creature wearing nonmagical armor or wielding a shield. In addition, once per day, you can use the weapon to cast fireball with a spell save DC of 18 and a base damage level of 10d6 fire damage.