This can be summarized as raw character power.
This comes from your Passive Tree, Support Gems on your skill, Ascendancy Passives, buffs granted by Spirit reserving skills, short term buffs granted by support gems like Ice Bite… but mostly, they come from gear and your passive tree.
Path of Exile splits damage boosts from gear, supports and the tree into two types, “more damage” and “increased damage”.
“More” and “Increased” multipliers almost always specify types of damage they apply to, such as:
- 30% increased damage with two-handed weapons
- 20% increased fire damage
These will only help if you deal the correct type of damage.
More/Less Damage
“More Damage” and the opposite, “Less Damage”, all MULTIPLY together.
This can cause them to have a huge effect. They are better than “Increased Damage” effects unless the increased have much higher numbers.
Example: Your character has five effects that read “200% more damage." Each one triples your damage. After applying one, you do 3x baseline damage. After two, 9x. After three, 27x. After four, 81x. After the final one, you’re at a massive 243x baseline damage.
Increased/Reduced Damage
“Increased Damage” and the opposite “Reduced Damage” are all added together, and these combine into ONE single layer that is multiplied.
Example: Your character has five effects that read “200% increased damage”. This adds to 1000%, so you do 11x baseline damage.
As you can see, more multipliers are precious, especially large ones. You will want to start planning builds with a question. “What big more multipliers can I fit into this build?” This is perhaps the most important question you will ask.
Increased multipliers, on the other hand, fall off quickly as you collect more of them. You still want these boosts, but not if the cost gets too high.