Who should I rank 5?

So I'm on 6.1.1 and I was wondering who I should rank 5 to help me.

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NF, BWCV, Warlock are all good options.

Specifically for 6.1 warlock will help the most. Fury, warlock, and bwcv are all great r5 options.

Warlock will help the most.

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all of them i find nf and warlock with the most utility. For cav go warlock for biohazard