Because he's also an Inhuman who's a Cosmic Based Class, the real question is why is Karnak the Only Champion with a Rank Up like this? If you use this logic then Champions like Magik/Phoenix/Warlock should also require a Mutant Catalyst on top of their Actual Class, same with Agent Venom who'd be the same case as Karnak, also Quake since she's another Non-Cosmic Inhuman, and so on. Not saying this should be a thing, but it's odd that Karnak is a Unique Case for no reason...
If I remember correctly, it was a thing Kabam was going to start doing, having awesome new champs that had a bit of "class crossover" making them so much better. Instead we got Karnak and they scrapped that idea. A lot of people complained about him and Kabam promised a buff. I got him as a 4* right after he came out and was happy he would get buffed. Years later and I'm still waiting on that buff! Lol I may be wrong about some or all of that but that's what I remember.
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He's transcending into cosmic class
If you use this logic then Champions like Magik/Phoenix/Warlock should also require a Mutant Catalyst on top of their Actual Class, same with Agent Venom who'd be the same case as Karnak, also Quake since she's another Non-Cosmic Inhuman, and so on.
Not saying this should be a thing, but it's odd that Karnak is a Unique Case for no reason...