Legacy Piece challenges players to explore sprawling islands, master diverse combat styles, and conquer formidable anime-inspired bosses. Progression demands time, patience, and meticulous build crafting, especially when high-tier weapons require conquering multi-stage questlines and repeated boss encounters across the seas.
The arrival of TYBW Aizen introduces one of the most destructive movesets in the game. Boasting lethal stack mechanics, an adaptable counter, and the destructive Hado Number 90, this weapon variant sets a new standard for combat effectiveness. However, unlocking this weapon and its full ability kit requires completing an extensive series of trials given by Shunsui, spanning multiple regions and demanding encounters.
This walkthrough breaks down every requirement needed to acquire TYBW Aizen and unlock its complete skill set. From essential prerequisites and boss kill counts to summoning the Quincy King and clearing Warwelt, here is everything you need to claim the Unshackled and Unbound titles.
Prerequisites Before Starting
Before you can undertake the unlocking process, you must prepare specific gear and stats:
- Aizen V1: You must own Aizen V1, and it must be fully enchanted.
- Stat Build: A weapon-focused stat build is strongly recommended, as most quest objectives require you to defeat bosses using Aizen V1.
- Quest Giver Location: Head to Quincy Castle and speak with the Shunsui NPC to accept the Prisoner of Muken questline.
How to Unlock the TYBW Aizen Weapon
Securing the base weapon requires completing the three initial quests in the Prisoner of Muken series.
Quest 1: Defeat Hollow Island Aizen
Your first objective tasks you with fighting the standard Aizen boss located on Hollow Island while wielding Aizen V1.
- Defeat the Aizen boss 60 times.
- Collect 10 Kyoka Suigetsu Echo drops.
- Tip: You can run this encounter on Normal difficulty to speed up boss clears, and configuring skills to trigger automatically can streamline the farming loop. Keep Aizen V1 equipped throughout the entire fight to ensure kill credit.
Quest 2: Defeat Ichigo Bankai
After turning in the first task, return to Shunsui to receive your second target.
- Defeat the Ichigo Bankai boss 20 times.
- Collect 5 Hogyoku Resonance items.
- Track your inventory frequently to confirm when both kill counts and material drops are fulfilled before leaving the area.
Quest 3: Defeat TYBW Aizen
Return to Shunsui to begin the final trial of the Prisoner of Muken chain.
- Defeat the Thousand-Year Blood War Aizen boss while using Aizen V1.
- Strict Rule: You cannot switch weapons at any point during this battle. Swapping away from Aizen V1 voids the quest requirement.
Defeating him completes the questline, granting you the TYBW Aizen weapon and the Unshackled title.
How to Unlock All TYBW Aizen Skills
Receiving the weapon only gives you access to a partial moveset. To unlock its signature abilities, you must complete two additional high-difficulty quests.
Quest 4: Standing Against the Almighty
Speak to Shunsui to accept this quest, which requires taking down the Quincy King across two distinct battlegrounds: Quincy Castle and the Warwelt dungeon.
To challenge the Quincy King at Quincy Castle:
- Farm standard Quincy mobs around the castle. Every 50 Quincy defeats allows you to summon one Sternritter.
- Defeat all five Sternritters.
- Engage and defeat the Quincy King once summoned.
- Repeat this process until you have defeated the Quincy King 5 times.
Next, you must challenge the Quincy King inside the Warwelt dungeon:
- Acquire the dungeon key, which drops from the Quincy King boss fight at the castle.
- Enter the Warwelt dungeon and defeat the boss inside. Because this version is significantly tougher, ensure your stats and equipment enchantments are maximized before entering.
Clearing Quest 4 unlocks the Hado Number 90 skill for your weapon.
Quest 5: Master the TYBW Aizen Encounter
Return to Shunsui for the ultimate challenge to finalize the weapon's potential.
- Defeat the TYBW Aizen boss 10 times.
- Gather 30 Suppressed Reiatsu materials.
- Obtain the rare Unbound title drop from the boss.
Fulfill these conditions to unlock all remaining skills and complete the Aizen progression path.
Weapon Mechanics and Combat Tips
TYBW Aizen excels in sustained skirmishes and high-pressure burst windows thanks to its stacking synergy:
- Stack Generation: Your first three weapon abilities accumulate stacks on hit.
- Enhanced Hado Number 90: Reaching 5 active stacks transforms Hado Number 90 into an empowered, enchanted variant that deals massive area-of-effect damage.
- Counter Mechanic: Activating the F ability provides a responsive counter. It handles incoming stack interactions and opens windows for follow-up counterattacks, offering reliable defensive protection during aggressive enemy combos.
- Build Optimization: While the weapon deals great damage baseline even without specialized defense penetration gems, pairing it with high-end enchantments and bonus damage gems elevates its damage output against end-game bosses.