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A new modifier with no actions defaults to a value of zero. The actions you
apply change that starting value of zero into something else, in the order
you specify. Looking back at our example from earlier, let’s say you apply
three actions: add 5, subtract 2, and multiply by 4. Let’s see how that affects
your resulting modifier.

Action Amount Result of Action Total
Modifier
Default for New Modifier 0 0
Add 5 0 + 5 5
Subtract 2 5 – 2 3
Multiply 4 3 x 4 12
Total Modifier: 12

The target setting is always modified by the total amount of all the actions
combined. In this example, it would be +12.
Since a new modifier with no actions always defaults to zero, the first action
must be either addition or subtraction, since multiplying or dividing zero
wouldn’t produce any usable results. This limitation only applies to the first
action in the list.

When you get started with a new action, you always start by deciding how it
will change the value. Do you want it to add to the value? Do you want to
multiply the value to scale the result? For the most part, you will get started
with Add actions, as they’re the easiest to work with.

Variable Amounts for Actions

Once you have chosen what type of action you want to use, you can begin
to get the variable set up. This amount determines how much is added,
subtracted, multiplied or divided.