Quick take: Japan · Tier V · Battleship · Premium
Black/B ships are tracked separately from their base hulls. Primary source cards prefer Black Friday or Black-specific official posts instead of generic base-ship mentions.
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Mutsu B is not a regular Tech Tree unlock. Known acquisition methods indexed by GamingDiver: Global XP, Containers. Container chances are shown as the listed odds of receiving this exact ship, dividing grouped ship-pool odds across the resolved ships and including nested container paths when a crate can drop another crate.
Black Friday Crate 2020
4.75%
V Mutsu B
Event containers · Black Friday Crate 2020 · 1 of 2 ships
Champion's Box
0.95%
V Mutsu B
Event containers · Champion's Box → Black Friday Crate 2020 · 1 of 2 ships
Black Friday Ultimate Crate
0.79135%
V Mutsu B
Event containers · Black Friday Ultimate Crate → Black Friday Crate 2020 · 1 of 2 ships
Ultimate Crate
0.475%
V Mutsu B
Event containers · Ultimate Crate → Black Friday Crate 2020 · 1 of 2 ships
Piñata Chest
0.117647%
Tier V or VI Premium ship
Event containers · Piñata Chest · 1 of 34 ships
Mutsu B is best played as a Japanese battleship that holds important water, absorbs pressure intelligently, and punishes broadside mistakes. Balance note: Official updates changed Mutsu B directly: April 2026: Improved dispersion with a new variant of Japanese dispersion inspired by Amagi; Turret rotation speed increased by approximately 18%; Rudder-shift time reduced by approximately 6% to match that of her sister ship Nagato; Added Engine Boost to slot 4; plus 3 more listed in Balance History below. Its value comes from disciplined salvos, careful angling, and committing only when destroyers and crossfires are under control.
Use open-water angles and patient positioning where you can keep guns active, angle between salvos, and avoid being forced into early brawls. Use cover and angled lanes to move from salvo pressure into a controlled close-range threat only after the flank is safe.
Do not turn broadside under battleship guns or rush into torpedo water; Japanese battleships hit hard but punish careless rotations. The common throw is overcommitting before the minimap is settled, then losing the ship’s best tools before they can matter late.
AL Fusou, Arpeggio Haruna, and Arpeggio Kirishima are useful Japanese battleship commander directions. Inspirations usually favor accuracy, reload, AP performance, HP, survivability, or secondary/brawling bonuses depending on how aggressively you want to play.
Use these as direction, not a fixed build sheet: tune the final commander, inspirations, and skills around your roster, matchmaking, and comfort.
Official ship-specific balance, stat, consumable, or tier-placement changes for Mutsu B. Cards are condensed; use each source link for full context.