Mod Stacking

The keywords "More", "Less", "Increased", and "Reduced" indicate how a mod stacks with other mods of the same type.

"Increased" and "Reduced" mean that all applicable mods of that type are added up, then applied. For example, two passives which give "8% Increased Energy Shield" would provide a total of 8 + 8 = 16% Energy Shield

"More" and "Less" mean that that bonus is a multiplier. Effects with "More" or "Less" are rarer and more powerful than "Increased" and "Reduced", and are usually limited to skills, Unique Items, and Keystone Passives. For example, if a player has "30% More Spell Damage on Low Life" from Pain Attunement, as well as "50% More Spell Damage" from Righteous Fire, they will gain a total of 1.5 * 1.3 = 95% more spell damage.