Lets say I have a base damage of 100 and skill that does double damage and another skill that does +5 damage. What would you expect?
205 damage
47%
210 damage
53%
Poll ended at .

@grumpygamer it really depends on the wording of the modifiers.

Without extra context I'd assume double damage works like a critical hit, where I expect the final damage to be doubled, i.e. 210.

Otherwise I would specify it as doubling the base damage. Or otherwise denoting that the +5 is added afterwards.

The important part is the wording as it shapes the expectation.

@grumpygamer If I had to set a formula I would go with a split of base damage and total damage.

Output = ((weapon damage + base addition) * base multiplier + total addition) * total multiplier

It does mean addition goes first.