I was doing some bounties and realized I still had the Nexus bounty to kill Sekrion. I know I killed him the day the bounty was there, and I've now killed him 3 times today, yet the bounty still isn't completed. Do I have to deal the killing blow or something? I've been playing since launch and don't recall this being the case on anything other than the walker bounties from the queens wrath.
Edit: Thanks for the help guys, I got it completed. It looks like the last thing you damage before the boss dies has to be the boss to get credit for the bounty.
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Used to happen to me back in the day a lot when I would not get the kill shot. But hasn't for a long time. Just figured the fixed it in one of the patches.