So ran across a Warlock in comp today who had a Dawnblade that was never ending. So I found the exploit and thought I'd share until it's patched.
[spoiler]And yes this is by far the most game breaking issue since Pocket Infinity.[/spoiler]
If you're interested in how to do this exploit until then, here is a guide for you all to try out. Might as well get everyone playing as Warlocks again.
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Watch bungie not fix it tomorrow