Cobra

Cobra (コブラ, Kobura) was a member of Oración Seis, a former Dark Guild composed of six powerful Mages. He, along with the other Oración Seis members, sought to find Nirvana, a destructive Magic that was sealed long ago.

Poison Dragon Slayer Magic (毒の滅竜魔法 Doku no Metsuryū Mahō): By having Dragon Lacrima implanted into his body, Cobra obtained the ability to use this Magic. It grants him the power to produce poison from his body and to consume the one produced from external sources to heal and strenghten himself, which, as a result, grants him immunity from poison. The poison that he produces from his skin is so corrosive that it is said to be able to decay all that it touches, but can also act after a given amount of time: Cobra stated that its effects are first visible in a progressive weakening of the victim's body, which then results in death.

• Poison Dragon's Twin Fang (毒龍の双牙 Dokuryū Sōga): Cobra moves his arms forward in a cross, forming a very large amount of poison in two massive waves shaped like fangs, which he uses to attack his opponents with great blunt force. In the anime, this spell was portrayed differently, with the generated poison being split in many elongated, snake-shaped masses, which all move towards the opponent at once.
• Poison Dragon's Roar (毒龍の咆哮 Dokuryū no Hōkō): Cobra's exclusive Dragon's Roar, incorporating the element of poison. Cobra generates poison in his mouth and then rapidly lets it out in the form of a poisonous breath that, when it hits, injects virus into his victims' bodies, slowing down their movements, weakening them and and slowly killing them.
• Poison Dragon's Fang Thrust (Dokuryū Totsuga): Cobra summons forth his Magic Seal in front of him, from which a wave of poison shaped like a snake's head, with large fangs, is generated. Such wave moves towards the opponent, and is capable of stopping their incoming attacks by "biting" them. It was strong enought to overwhelm Natsu's Fire Dragon's Iron Fist.
• Poison Dragon's Spiral Jaw (Dokuryū Rasengaku): Cobra jumps in the air and, when he is upside down, gathers poison on his legs and kicks the opponent by performing a rotation. This attacks is highly reminiscent of Natsu's Fire Dragon's Claw, and was notably employed against it.
• Poison Dragon's Scales (Dokuryū Ringa): Cobra uses his Magic Seal to generate a very large number of scale-shaped masses of poison, which he rapidly sends flying at the opponents in consecutive reprises.

Dragon Force (ドラゴンフォース Doragon Fōsu): Cobra has been shown capable of achieving this advancedDragon Slayer's condition, likely due to his powers being artificial. Dragon Force turns Cobra's arms into deadly, poisonous dragon's claws, which grant him the ability to perform various attacks.