Quote Originally Posted by LudicSavant View Post
I also don't like that Mighty Deed doesn't have the temp HP expire. So it sort of rewards you for finding a decidedly unmighty deed to build up the party's temp HP before they go and perform an actually mighty deed.

Yes, it's something the DM can just say "NOPE" to, but with better written rules they wouldn't have to. It's inelegant, and I hope they do indeed correct it at some point.
The standard wording is "When you reduce a hostile creature..."

Just pop that line in. Its obviously missing. Not a big deal.