Sounds like you pulled a cosmic gem from necro. But I presume you’ll still be an r3 away from valiant. For that reason I believe you should wait until you can r3 another champ. Doesn’t sound like you a pressing need for any of them for content. See if you get a better cosmic in the next few months.
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If your hype was duped I would have picked him.
Anyways aarkus is great, I find gorr to pretty underwhelming in bgs, so it's between aarkus and unduped Hyperion