Fusion

Fusion is the process by which mods are combined together to create a more powerful mod. Fusion requires at least two mods or a single mod and a Fusion Core.

Fusing mods increases their level and increases the power drain of the mod. The rarity of the mod being fused or used to upgrade another greatly impacts the price. It is generally more efficient to use lower rarity mods to upgrade mods.
 * Fusing a duplicate - 100% (1 duplicate required to reach level 1)
 * Fusing of matching polarity - 50% (2 matching polarity Mods to reach level 1)
 * Fusing unrelated - 25% (4 unrelated Mods to reach level 1)

Fusion Process
To perform fusion on a mod a player must do the following:
 * 1) Navigate to the arsenal.
 * 2) Click the "Mods" option in the bottom left.
 * 3) Select the mod you wish to upgrade.
 * 4) * When combining mods of the same type, always choose the higher level one first. Choosing the lower level mod first will result in a mod weaker than than you had originally.
 * 5) Select the option Fusion.
 * 6) Select a 2nd mod or Fusion Core
 * 7) Select the option Fuse
 * 8) A popup will appear with a credit cost.
 * 9) Click Yes to continue.

The fusion process is complete and the 2nd mod selected will be consumed. The energy will be added to the mod. If the energy level is full, the mod will upgrade.

Upgrade Energy
For simplicity, these numbers are based on a mod leveling up each time it gains 24 upgrade energy. Each rank that a mod has when another mod is fused with it reduces the fusion upgrade energy gained by 1/2. This penalty is multiplicative, so rank 2 mods gain 1/4, rank 3 gain 1/8, etc. Uncommon Mods additionally gain 1/2 the energy that commons do and rares gain 1/3.

Mod Credit Cost
To upgrade any existing mod you need credits and cores or other mods. When using cores, consider this:
 * Common mods base price is 200, plus 150 times its level for cores.
 * Uncommon mods base price is 500, plus 300 times its level for cores.
 * Rare mods base price is 1000, plus 450 times its level for cores.

Example
To fuse a common core of level 3 would cost 750 to fuse. A rare core of level 5 would cost 3150. When a mod would only be the base price.