***Rimefire Plate* would reduce *Rimehound Bite* damage by 2, or 1 for each type**, for consistency.

While applying resistance once for each damage roll seems to be a easy way out, it collapses when facing anything more than a simple resist all.

Let's say an attack deals `10 fire damage and 8 cold damage`.
If the target has `fire resist 6`, results is 12 damage.  Make sense.

However if the target has both `fire resist 6` and `cold resist 5`, you have to decide which one to use.

If you say the higher apply, what happens when the damage is `1 fire damage and 17 cold damage`?

* Do you stand by fire resist 6 and says 5 point of fire resistance bleeds out into the cold damage?
* Do you say at most 1 fire resistance apply, so that cold resist 5 is now higher?

If you say the lowest apply, again what happens when the damage is `17 fire damage and 1 cold damage`?

* Do you stand by cold resist 5, confusing it with `18 fire and cold damage`?
* Do you say at most 1 cold resistance apply? *It is easier to give up and calculate them independently.*

If you are still not convinced, many ghost like creature has `Resist insubstantial; Vulnerable 5 psychic`.
How are you going to apply insubstantial resistance when it is dealt untyped and psychic damage in one blow?
What if another creature gave it some mixed resistance? (It happened in my game)

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RAW and RAI, `cold damage` is different from `fire damage`, and both are different from `cold and fire damage`.
Resistance doesn't stack, but only *for the same damage type*.

**By calculating immunities, resistances, and vulnerabilities independently for each damage type, you keep you sanity while getting believable result.**