Most undead are not weak to radiant in DnD 5e. I want to fix this!
Undead Destroyer
The light you bring makes all who serve unlife shrink to the shadows. Gain the following benefits:
- Increase your Intelligence, wisdom, or charisma by 1 to a maximum of 20.
- When you do radiant damage to an undead, it must make a Charisma saving throw. On a failure, it gains damage vulnerability: radiant for one turn, including the attack you just did.
Thoughts?
Isn’t that what a cleric and/or paladin already does? No one else can do radiant damage unless it is a special weapon that can do so. It seems pointless and why the save? Undead don’t usually need to save against radiant damage to begin with.