[quote=@Lucius Cypher]
I say we go about chopping off the heads of the Kobolds. How do coup de grace work in 5E? I've never had to use it before.
[/quote]
Coup de grace in itself is not a mechanic. Kobolds are asleep and prone though, and when attacking prone targets you are granted an advantage on any melee attack roll on them from 5 feet or less away, I believe. Now I need to go to bed though, will be back in the morning.