The wasting in sunlight is just a neat mechanic that's underused.
Some thoughts on flavor. One: what's the relationship between cave lords and barghests? Both of them fill the "big, cannibal goblin-boss" dynamic. Second: now that kobolds aren't goblinoid anymore, we're going to have to make some minor alterations. Perhaps cave lords direct their goblinoid tribes to raid kobold warrens for delicious captives?