Oath of Devotion has the "Holy Nimbus" feature, which are supposed to damage all enemies in range:
Whenever an enemy creature starts its turn in the bright light, the creature takes 10 radiant damage.
What is "an enemy creature"? AFAIK, there is no such term in D&D.
Spells and feature descriptions have more precise criteria normally:
- "each creature in an area" - when it's an AoE
- "unwilling creatures" - when it's an effect that can be recieved voluntarily
- "choosen creatures" - when targets are supposed to be explicitly chosen by the caster
Spells never affect just "enemy creatures". What if the Paladin doesn't think it is enemy? What if he/she is unaware of its presence?