Minecraft wiki entry for Attribute, associated text: multiply (amount % +/-, multiplicative): Saved as operation 2. For every modifier, multiplies the current value of the attribute by (1 + x), where x is the amount of the particular modifier. Functions the same as Operation 1 if there is only a single modifier with operation 1 or 2. However, for multiple modifiers it multiplies the modifiers rather than adding them. For example, modifying an attribute with {Amount:2,Operation:2} and {Amount:4,Operation:2} with a Base of 3 results in 45 (3 * (1 + 2) * (1 + 4) = 45).[5]