Respect Archenemy!
He only appeared in four issues (X-men : Magik) but man did he tear stuff up! This thread won't really be broken up into sections like "Origin" or "Fights" because he's (it's) amorphous for the first few issues and only takes shape in the final showdown. But you'll see how powerful he is/was.
Amanda Sefton, aka Magik II, decides to build a database of all the universe's known magic on Earth, away from the 'background noise' of the Splinter Realms. What could possibly go wrong? 😉 Well like Skynet, the thing becomes self aware and travels back in time to secure the era of it's birth, then goes on a rampage!