Itsuku
Itsuku is a 5★ Psionic-class Partner in Chaos Zero Nightmare. Equipped on a Combatant, Itsuku raises ATK by +16–24% (Always active) and Attack card DMG by +5–10% (per card stacked). Itsuku's EGO skill, Moonlit Leisure, can be used for 4 cost. Rewritten in plain terms from in-game data — not a copy of the original wording.
Partner Passive
Tranquil Marker
What this partner does when equipped, explained buff-by-buff (values shown as a low→high investment range).
| Buff | Amount | Condition |
|---|---|---|
| ATK | +16–24% | Always active |
| Attack card DMG | +5–10% | per card stacked · max 3 stacks |
| Fixed Damage | +30–60% | when an attack card deals 3 hits |
Rewritten in plain terms from in-game data — not a copy of the original wording.
Level-by-level upgrade table
Official in-game data across all 5 investment tiers (not just the low–high range).
| Buff | Tier 1 | Tier 2 | Tier 3 | Tier 4 | Tier 5 |
|---|---|---|---|---|---|
| ATK · Main stat boost | +16% | +18% | +20% | +22% | +24% |
| ATK | +8% | +10% | +12% | +14% | +16% |
| Attack card DMG | +5% | +7% | +8% | +9% | +10% |
| Fixed Damage | +30% | +38% | +45% | +53% | +60% |
Rewritten in plain terms from in-game data — not a copy of the original wording.
EGO Skill
A special skill this partner can activate by paying the cost below.
200% Damage to all enemies. 1 Fierce Winds.
Is Itsuku Worth Investing In?
Itsuku is a 5★ partner whose passive raises ATK by +16–24% across 5 official investment tiers — a solid pick whenever your team needs that stat.
Which Combatants Does Itsuku Work Best With?
Itsuku is a Psionic-class partner. Its main effect grants a ATK bonus, so it fits any Combatant whose damage or survivability scales with ATK, not just one fixed unit.
What Does Itsuku's EGO Skill Do?
Itsuku's EGO skill, Moonlit Leisure, costs 4 and does the following: 200% Damage to all enemies. 1 Fierce Winds.
