NIKKE Harmony Cube Guide: What All 14 Cubes Do And Which Nikke Wants Which

Each Nikke can equip exactly 1 Harmony Cube at a time. Unlike gear, a cube can't move between different slots, but it CAN be removed from one Nikke and equipped on another — its upgrade level is NOT lost when you do this.

Leveling a cube requires a "Battery" item specific to that cube type, obtained from Lost Sector or the Union Shop. Per older data (gamingonphone.com — worth re-verifying since it may be outdated after several updates), the historical Lost Sector unlock order was: Assault → Lost Sector 1, Onslaught → 2, Resilience → 4, Bastion → 7, Adjutant → 9, Wingman → 11.

The most familiar group, equipped on most day-to-day PvE squads:

• Resilience Cube — boosts Reload Speed; from level 5 it also adds elemental damage. Good on Nikkes with long reload animations like Scarlet, Alice, Pepper, Drake, Rapunzel, Anis: Sparkling Summer.
• Bastion Cube — refunds part of your ammo on hit; useless on Nikkes with a "last bullet" mechanic. Good on sustained-fire DPS like Modernia, Scarlet, Guillotine.
• Wingman Cube — increases Max Ammo capacity. Good for shotguns and core DPS that need lots of ammo for a long burst window.
• Adjutant Cube — boosts Charge Speed. Good on Snow White, Alice, Rapunzel — Nikkes that need to charge fast.
• Assault Cube — boosts Hit Rate; from level 5 also adds elemental damage. Good on Drake, Maiden, Anis: Sparkling Summer, Noir, Guilty.
• Onslaught Cube — boosts Charge Damage; from level 5 adds a significant elemental damage bonus. Good on Sniper Rifle/Rocket Launcher units like Maxwell.
• Quantum Cube — boosts Burst Gauge generation, but is ONLY useful in PvP content (Arena/Union Raid PvP). Good on Centi, Jackal, Anis, Emilia, Rumani.

The newer group, leaning toward HP/defense/healing/special damage:

• Relic Vigor Cube — boosts Max HP. Good on Nikkes that scale damage/healing off Max HP, like 2B, Rapunzel, Noise, Mary: Bay Goddess, Frima, Blanc, Marciana.
• Endurance Cube — boosts DEF, mainly for PvP. Good on Scarlet, Blanc, Moran.
• Healing Cube — boosts HP Potency (how much healing you receive); if the wearer has a healing skill, it also boosts Heal Provided. Good on Noise, Mary: Bay Goddess, Rapunzel, Blanc, Marciana.
• Relic Tempering Cube — reduces damage taken. Good on Scarlet, Blanc, Noise, Moran.
• Relic Assist Cube — grants bonus HP when the wearer drops to Critical HP (roughly 20% HP threshold).
• Destruction Cube — boosts Part Damage, usable on any character as long as the boss has destructible parts. Good on Rapi: Red Hood, Asuka: Wille, Snow White.
• Piercing Cube — boosts Pierce Damage. Good on Red Hood, Alice, Snow White, Maxwell, Grave, Asuka.

Note: exact per-level percentage tables for most cubes (aside from a few confirmed data points like Resilience at level 3 ≈ +22% or max level ≈ +29.69%) couldn't be fully retrieved, since the source pages with detailed tables (the NIKKE community) block automated access — the remaining specific numbers still need manual verification.

If you're not sure how to build a specific character yet, Resilience and Bastion are the safest default picks — cross-referencing multiple guide sources (the NIKKE community), this pair covers most of a typical roster since most Nikkes benefit from either reload speed or ammo refund. For more specific roles, pick by class: core Attacker DPS usually favors Bastion/Wingman, Supporters/Defenders usually favor Resilience, and healers should prioritize Adjutant to shorten the gap between heals.