It just says "the spell's damage type" so one can interpret this as only "one" damage type, but the use of "the spell's" isn't necessarily meaning singular - the spell's damage type is any and all damage it does. If the spell has multiple damage types I see no reason to limit this. Technically, you'd be making the spell weaker in most circumstances. The only way to maximise potential from damage-type swapping is through multiclassing and multiclassing in most cases makes your character weaker overall, in exchange for a single gimmick that, if necessary, a DM can easily compensate for.
For instance switching all damage types of Prismatic Wall to Lightning when you have 2 levels of Tempest Cleric to do Channel Divinity: Destructive Wrath. I mean, that's great. But rely on it and you're just going to end up with a lot of enemies suddenly resistant or immune to lightning & thunder damage. There's also the fact that anything you can do, an enemy can do. So it's good for a time or two. And for that time or two you've traded out the far more useful 7th level slot, extra spell preps, 4 free spells, 2x 3rd level spells to cast every short rest, and an ASI.
For instance switching all damage types of Prismatic Wall to Lightning when you have 2 levels of Tempest Cleric to do Channel Divinity: Destructive Wrath.
A waste of 2 levels, for a once per rest ability on one spell/attack.
For instance switching all damage types of Prismatic Wall to Lightning when you have 2 levels of Tempest Cleric to do Channel Divinity: Destructive Wrath.
A waste of 2 levels, for a once per rest ability on one spell/attack.
It could be quite devastating for something like a lightning fireball, but it will only max 1 layer from the wall since they are all separate rolls.
Can I change a spell that has 2 damages at once, like Prismatic Wall or Meteor Swarm, to both be one type of damage?
That is probably up to the DM, but I'd let players change each type to any type.
Yes.
It just says "the spell's damage type" so one can interpret this as only "one" damage type, but the use of "the spell's" isn't necessarily meaning singular - the spell's damage type is any and all damage it does. If the spell has multiple damage types I see no reason to limit this. Technically, you'd be making the spell weaker in most circumstances. The only way to maximise potential from damage-type swapping is through multiclassing and multiclassing in most cases makes your character weaker overall, in exchange for a single gimmick that, if necessary, a DM can easily compensate for.
For instance switching all damage types of Prismatic Wall to Lightning when you have 2 levels of Tempest Cleric to do Channel Divinity: Destructive Wrath. I mean, that's great. But rely on it and you're just going to end up with a lot of enemies suddenly resistant or immune to lightning & thunder damage. There's also the fact that anything you can do, an enemy can do. So it's good for a time or two. And for that time or two you've traded out the far more useful 7th level slot, extra spell preps, 4 free spells, 2x 3rd level spells to cast every short rest, and an ASI.
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A waste of 2 levels, for a once per rest ability on one spell/attack.
It could be quite devastating for something like a lightning fireball, but it will only max 1 layer from the wall since they are all separate rolls.
It would be for a gestalt character and the gestalt is a monk so not much wasted