So if you put an “Energy Siphon” Aura with a value of seven into a slot with a Polarity that looks like one long dash, you’ll get 14 extra Capacity instead. Except they’ll provide double the usual benefit. If you match the symbols on either of those Mods they’ll still increase your total Mod Capacity, as usual.
The two exceptions to this rule are Auras and Stances. This will make the Mods in question use only half as much Capacity as normal and allow you to equip more Mods with higher number values than usual. All of which is to say that you want to match Polarity symbols between Mods and slots as much as possible. If you put a Mod into a slot with a different symbol, the Mod’s value will double. The math is pretty simple: if you put a Mod into a slot with its corresponding symbol, the amount of Capacity that Mod requires will be cut in half (rounding up). They denote the Mods’ and slots’ Polarities, which are extremely useful in the process of upgrading. These correspond to symbols found on every Mod in the game.
When looking at the open Mod slots on any piece of equipment you might notice some of them come with small, white symbols. They cannot, however, change the amount of Capacity a Mod requires when it’s equipped. Stances, Auras, and a couple of other things we’ll get to later in this guide can increase an item’s maximum Capacity.