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For clarity I am not talking about resistances.
I am speaking of Tempest-Sun Redirection and Tempest-Sun Shielding
Can those reductions to damage stack?
Also how does each interact with multiple types of damage being dealt with a single attack? Let's use a situation where 25 slashing and 25 fire damage would be dealt by a single spell effect.
Since it's not Resistances, that means Resistance rules don't apply, which means it doesn't apply to each amount equally/separately, similar to Resist All.
That being said, this reduction would seem to apply after you've calculated the total and would proceed to apply it to yourself, meaning once you factor in Resistances/Weaknesses and the like, then this effect would take place. In this case, with Tempest-Sun Redirection, once you take the 50 total damage, you reduce it by an amount equal to twice the spell level, with Tempest-Sun Shielding tripling this amount.
So let's say you burned an 8th level spell for both of these, this reduces the damage down by 48, after Resistances/Weaknesses are applied. The reason they can stack is because they aren't typed to a given mechanic, nor are they stated to be a bonus type of any sort, meaning it's just free damage reduction.
Yeah, it looks like they have created custom damage reduction rules rather than using the normal damage reduction rules (Resist All).
If Tempest-Sun Redirection said that it gave you Resist All to the damage from the targets of your ability then it would work effectively the same - except that it wouldn't stack with other sources of damage resistance. Same if Tempest-Sun Shielding gave you Resist All equal to 4x the spell level.
But instead of doing normal damage reduction, it is doing a custom 'reduce the amount of damage' effect. So I guess it becomes an untyped penalty to damage. And untyped penalties do stack.
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Yeah, it looks like they have created custom damage reduction rules rather than using the normal damage reduction rules (Resist All).
If Tempest-Sun Redirection said that it gave you Resist All to the damage from the targets of your ability then it would work effectively the same - except that it wouldn't stack with other sources of damage resistance. Same if Tempest-Sun Shielding gave you Resist All equal to 4x the spell level.
But instead of doing normal damage reduction, it is doing a custom 'reduce the amount of damage' effect. So I guess it becomes an untyped penalty to damage. And untyped penalties do stack.
If it is counted as a damage penalty, it is applied at step 1 when damage is added, before types are determined. If so, how would that interact with an effect dealing different types, like blazing dive?
*shrugs* Have the caster pick one of the types to reduce. Or reduce all of them like how Resist All would behave.
That's the problem with defining a custom effect instead of using the standard ones. You have to define everything or else it gets left up to the players to fill in the gaps.
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Basically, I see two ways of adjudicating these.
1) It behaves as a a penalty to damage, thus is applied at step 1..ish..2..ish. If there are different types of damage, you subtract from the pool of reduction equally between the types. If a type is reduced to 0 before the pool is empty, it then gets applied to any that are left.
i.e. An effect does 4 fire and 15 slashing with a reduction of 12; the fire is reduced to 0 and the slashing is reduced to 7.
Pros: application before weaknesses
Cons: application before resistances
2) The damage reduction happens after weakness/resistance and the total is simply reduced.
Pros: application after resistances
Cons: application after weaknesses
