Khazid'hea
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Khazid'hea is a fictitious sword in the Forgotten Realms setting. Khazid'hea means "Cutter" in the Drow dialect.
Khazid'hea is a finely crafted blade that can cut through flesh, bone, armor, and even rock. The blade itself is sentient, and whenever Catti-brie is either exhausted or weak of mind, Khazid’hea can project its “thoughts” into her head and even affect her reasoning. On the occasions this has happened, she has gone into battle against impossible numbers without realizing it until her enemies lay dead before her. In the process, she often gets hurt, but doesn’t notice. Khazid'hea is always hungry for blood and battle, and it is never sated.
Khazid'hea has one desire: to be held by the greatest warrior. In efforts to do so, it will alter its hilt to appeal to its wielder. In order to become the weapon of Dantrag Baenre, it shaped itself into a demon's head. While attempting to snare Drizzt Do'Urden, it changed its handle into the head of a unicorn (the symbol of Mielikki). When it accepted Catti-brie, Khazid'hea adopted the form of the panther Guenhwyvar, with the symbols of the dwarven gods etched into its side. The sword at one point is wielded by Drizzt Do'Urden during his fight with Obould Many-Arrows, which he loses after the sword gets stuck in Obould's armor. Khazid'hea is now wielded by Tos'un Armgo after he found it in the armor left behind by Obould Many-Arrows.
This weapon shares some similarities with Michael Moorcock's Stormbringer, another sentient, bloodthirsty, supernaturally sharp sword that could sometimes influence its wielder's actions.