Keyword:Boosted

When an attack is boosted, one more of the largest damage die is added to the damage roll. If there's multiple damage dice of the same size that would tie for being the largest, combine all the different damage types together in the damage die that is added.

If an attack that normally deals 2d4+1d8 damage gets boosted, it deals 2d4+2d8 damage instead.

You are using Might Strike and Control and Resist Fire while making a Basic Attack with a dagger. This deals 1d4 mundane damage + 1d4 fire damage + 1d4 holy damage + 1d4 fire holy damage.