Main Power Up

Main Power Up is an ability in Splatoon 2 added in the update.

The ability appears in both primary and secondary gear slots, and will have different effects on each main weapon, even inside the same weapon class.

All gear previously available in the shops that had are now available with Main Power Up.

Known effects
The effects of Main Power Up are displayed on the Equipment screen on the info tab for the abilities for the currently selected Main weapon. The benefits from Main Power Up will vary from weapon to weapon. Weapons which acquire increased damage are incapable of decreasing the number of hits required to splat an undamaged opponent, but the damage total for each hit will be slightly increased.

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Shooter

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Roller

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Charger

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Slosher

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Splatling

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Dualie

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Brella

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Gear
Main Power Up is the main ability of:

Stacking
The table below shows how much Main Power Up increases Damage for weapons whose effect are damage increase.

Calculating Damage
A = Ability Points of Main Power Up = 10 × [Number of Main Power Up Main Slots] + 3 × [Number of Main Power Up Sub Slots]

For L-3 Nozzlenose

Damage=[Base Weapon Damage]*(1+(0.99×A−(0.09×A)^2)÷100)

For H-3 Nozzlenose

Damage=[Base Weapon Damage]*(1+(0.99×A−(0.09×A)^2)÷120)

For Shooters & Dualies & Splatlings & Splat Charger & Bamboozler

Damage=[Base Weapon Damage]*(1+(0.99×A−(0.09×A)^2)÷150)

For Rollers & Goo Tuber

Damage=[Base Weapon Damage]*(1+(0.99×A−(0.09×A)^2)÷200)

Damage Cap
After the damage cap is reached, adding more Main Power up will not increase your weapon damage.

Trivia

 * Main Power Up is one of first two abilities to be added to the game post-release. It however remains as the only truly unique ability, unlike Bomb Defense Up DX.