Unknownreported this bug
I'd love for my bosses to grant a reward the moment they die, but the Reward Menu GUI popping up when there still may be other things to fend off can be troublesome.
I would love an option that makes the reward automatically get put into your Rewards inventory without the GUI. And maybe even a little message in the chat detailing what you got.
"> You Received 3x [Essence of Courage]! Check your Rewards!" or something like that.