Ancient artifacts forged by the Draconborn blacksmith Vorales, born of the scales of Bahamut and the fangs of Tiamat. These were gifts to Dragon Tyrant Keiren, before his fall from grace.

The Immortal Morphing Fang

Weapon, legendary (requires attunement)

This weapon is made out of shards of shards of Tiamat's fangs, one from each of her five heads. It has a +3 bonus to attack and damage rolls, and has five forms, one based on each head, which it can change as a bonus action.

Black. The weapon is a glaive, and deals an additional 2d6 acid damage.

Blue. The weapon is a rapier, and deals an additional 2d6 lightning damage.

Green. The weapon is a dagger, and deals an additional 2d6 poison damage.

Red. The weapon is a longsword, and deals an additional 2d6 fire damage.

White. The weapon is a battleaxe, and deals an additional 2d6 cold damage.

Additionally, the weapon has the following special properties:

Tiamat's Wrath. Bonus damage dealt by this weapon's different forms ignore resistance to damage types, and treat immunity to those types as resistance.

Storm of the Dragon Queen. As an action, you can form a storm of destructive energy that lasts up to one minute, which you must keep concentration on, as if concentrating on a spell. The storm is a 20-foot radius sphere centered on yourself, and when a creature other than yourself starts its turn in the storm, it takes 2d10 damage of the same type as the bonus damage dealt by your currently active weapon form. This property recharges at the start of the next dawn.