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== Calculation ==
While items often display resistance as a flat percentage (e.g., +20% Resist), multiple sources of resistance do not simply add together. Instead, they stack '''multiplicatively'''.

=== Calculating Resistance ===
To find your total resistance, use the following formula:

<math>\text{Total Resist} = 1 - (1 - R_1) \times (1 - R_2) \dots</math>

'''Example:'''
If you have two sources of resistance, one providing '''40%''' and another providing '''20%''':
# Convert percentages to decimals: 0.40 and 0.20.
# Subtract from 1: (1 - 0.40) = '''0.60''' and (1 - 0.20) = '''0.80'''.
# Multiply the remainders: 0.60 × 0.80 = '''0.48'''.
# Subtract from 1: 1 - 0.48 = '''0.52'''.
# Your Total Resist is '''52%'''.

=== Calculating Resistance Reduction ===
'''Resistance Reduction''' (often called "shred") acts as a counter to resistance. It is calculated separately using the same multiplicative formula, and then subtracted from the target's resistance.

<math>\text{Final Resist} = \text{Total Resistance} - \text{Total Reduction}</math>

'''Example:'''
A target has '''52%''' Total Resistance (as calculated above). You attack them with two sources of Reduction: one providing '''25%''' and another providing '''20%'''.

'''Step 1: Calculate Total Reduction'''
<math>1 - (1 - 0.25) \times (1 - 0.20) = 0.40 \rightarrow \mathbf{40\%}</math>

'''Step 2: Subtract Reduction from Resistance'''
<math>52\% - 40\% = \mathbf{12\%}</math>

The target has a final effective Resist of only '''12%'''.

=== Negative Resistance ===
If the Total Reduction is higher than the Total Resistance, the final value will be negative. This acts as a damage amplifier.

* '''30% Resist:''' You take '''70%''' of incoming damage.
* '''0% Resist:''' You take '''100%''' of incoming damage (True Damage).
* '''-30% Resist:''' You take '''130%''' of incoming damage.