Hunters and titans have abilities that can kill other guardians, so it's dumb for warlocks to be excluded from the party. Next season should be a void season, which is why I'm bringing it up. At the very least, it should one-shot with contraverse hold.
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I'll give you the last part. There should be an exotic that makes that happen. (And yes, I would be fine if they moved the OHK knife to an exotic, even though it requires a precision hit, which HHSN and Titan OHK's don't.)