Player builds a new character, a Cleric of Lathander. What he really likes about this god is his association with sunrises and light in general. So of course, he takes the Light Domain. But most of the Domain Spells deal fire damage and are fire-themed, for example Burning Hands, Flaming Sphere, Scorching Ray, etc.
So now I’m thinking about letting him change the damage type of all those spells from fire to radiant. (The description of how the spells look like would change as well). In most cases, this would not make a difference. Damage is damage. But some monsters have Resistances, Immunities or Vulnerabilities against fire/radiant damage. (And Zombies for example can be put in the ground more easily with radiant damage).
I’m not sure if this is a good idea or not. I don’t want to allow this and then have to deal with an unbalanced game. Do I forget or misjudge an important aspect that will bite me in the ass later?
Best Answer
Radiant is way less resisted
Fire damage is the second most resisted damage type (with 77 creatures of the Monster Manual either being resistant or immune, 9 are vulnerable to it).
Radiant on the other side is the second least resisted damage type (with 4 creatures being resistant, not a single one immune and one is vulnerable to it).
Still, it depends on the encounters you build and the creatures you use.
Source: User Yorrin's post on giantitp.com