Yamato

Yamato is a timed Sea 1 boss stationed at Judgement Island, respawning every 6 minutes and 30 seconds. Sharing the same 850 million HP as True Manipulator but on a free-access timer rather than a sigil gate, Yamato is the more consistently farmable of the two — no consumable cost, just show up before the spawn window closes. The name and setting carry a sense of ceremonial weight: Judgement Island frames each fight as a proving ground rather than a routine encounter.

The guaranteed drop floor is exceptional among Sea 1 timed bosses. Every kill yields both a Race Reroll and a Trait Reroll (100% each), Boss Tickets at 70%, and a Dungeon Key at 60%, giving the encounter remarkable floor value even when the rare tier doesn't cooperate. Frozen Will at 4.25% is the first meaningful rare, followed by Yamato Essence at 2.5%, a resource tied to weapon-specific progression. Silent Storm (1.15%) and the Blade Sovereign Title (1%) are close in odds, while Imperial Outfit Accessory at 0.9% and Azure Heart at just 0.5% represent the hardest grind the table offers.

With a 6m 30s timer and 850M HP to clear, a mid-sized coordinated group is ideal. The guaranteed Race and Trait Reroll on every kill, combined with the 60–70% odds on Dungeon Keys and Boss Tickets, make Yamato a uniquely efficient stop for players advancing through multiple Sea 1 progression systems simultaneously.