Resonance

The resonance mechanic, introduced April 27, 2021, allows some ships to be equipped onto another ship, increasing the equipped ship's stats and granting them an ability. Materials for unlocking and upgrading resonance bonuses can be obtained from the co-op quest shop or by trading in gacha spark medals and  Omni-Factors at the Ships tab of the shop.

Resonance Bonuses
Ships will gain stat bonuses based on their base status (e.g. If Warspite is equipped onto Oakland and Oakland's HP was 1,000, Warspite's 25% resonance bonus at lv100 will boost this to 1,250 HP; this is not exact). Note all bonuses in the table below are for resonance level 100. See individual ship pages for their resonance skills.

Unlocking a Resonance Ship
Ships can have their resonance bonus unlocked from the Dock. Ships with unlockable resonance bonuses are indicated with the icon (red arrow) Ships with unlockable resonance bonuses have the 共鳴強化 tab (red arrow), and the button indicated by the blue arrow unlocks/upgrades their resonance bonus in exchange for materials.

Equipping a Ship with a Resonance Ship
Ships can be equipped with resonance ships through the fleet menu (red arrow) by selecting the resonance slot on the ship (blue arrow). This will bring you to the resonance menu. This menu can also be reached from the Dock by selecting a ship and selecting the 共鳴 tab (red arrow in the image below). Select the box indicated by the blue arrow to select a resonance ship. Ships need to have their resonance skill unlocked before they can be used as a resonance ship. This is indicated on the bottom right of the ship as either "in resonance" (purple arrow) or  "unavailable for resonance" (green arrow). Only ships that are "in resonance" can be selected. Once a resonance ship has been selected, the stat bonus (7.5% in this case) and resonance skill are displayed. Note that a resonance ship can only be equipped onto one ship at a time (equipping onto a new ship will unequip it from its current ship).