Origin

The Adversary's goal is to destroy this universe and replace it with a new one under his control. He is an energy being with no physical form and so magic must be used to defeat him, but he has also shown weakness to cold iron, steel, and Adamantium. The Cheyenne Indians were aware of Adversary's existence and their shaman, Naze, often battled him. Naze eventually trained Forge to take his place. Adversary felt that his biggest threats on Earth were Storm and Forge, so he took on the form of Naze and tricked Storm into thinking that Forge was trying to destroy the Earth because he was under the control of Adversary. He had opened a portal to his dimension through which many demons were pouring out. Adversary led Storm to believe that this was Forge's doing and sent her to stop him. Forge was near the portal because he was trying to close it but Storm saw him and stabbed him and they both fell into the portal. Roma, the Goddess guardian of known dimensions had been captured by Adversary and the X-Men were battling him. Storm and Forge escaped and came back to help in the battle. The X-Men sacrificed themselves so that Forge could cast a spell converting them to energy which he could use to defeat Adversary. Adversary was defeated and sealed away in another dimension and the sacrifice of the X-Men would keep him there forever. Roma stated that the chaos that Adversary believed in had the potential to better this universe and so he must not remain sealed away. She then resurrected the X-men.

Major Story Arcs

Fear Itself

Adversary can be seen as one of the demons at The Infinite Embassy, more precisely he was at the Devil's Advocacy, inside the Embassy, arguing with the other demons who should be the true Satan.

Powers

He can assume any form he desires. May be fought successfully through magic, but not through most forms of physical force. He is vulnerable to iron, steel and adamantium.

The Adversary has the power to turn reality into the ultimate void "Oblivion". He wanted to destroy 616 Universe and recreate it from primal chaos. He has enough power to send Storm and Forge to a parallel universe which he created as their prison. Adversary also destroyed Forge's mountain of power which is a pinnacle of the magical energy source of the Shaman on infinite Earth. After destroying the mountains in the multiverse, Adversary tainted the magical source with his chaos. He is shown to be one of the strongest demons in Journey into the Mystery. Adversary is also stated to be Pan-Dimensional and his physical dimension of chaos "Spiritlands" is stated to be the last and greatest gate in existence. He even took control of the Starlight Citadel which is a nexus to encompass all of existence. Adversary always have incarnations and it is shown one needs the Phoenix Force to reach full power. It is stated that Adversary's true nature exists in the Cold Dark Room which is the opposite of the White Hot Room. Haven using Adversary powers could send opponents to Oblivion or make plane of realities stated to be a pocket "between worlds". This plane was the borderland of the omniverse (everything) and Oblivion (nothing) and In his true form, the Adversary was not composed of physical matter but energy. He is stated to be the "shadow themselves" and born in the darkness.