Seirei is a famous sword that many people want in the Fruit Seas. It’s a black sword that is supposedly wrapped in “legends.” If you want to get this special sword, this guide will tell you exactly where to look for it.
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Fruit Seas – How To Get Seirei Weapon
Unlike some weapons in Fruit Seas, the Seirei isn’t found by defeating a boss or buying it from a certain NPC. Instead, you have to look for it by opening chests. Go to the Indomitable Fortress and head inside the prison tower.
Once you’re inside, you need to look for chests. The chests have a 15% to 20% chance to drop the Seirei, but there’s a huge catch. When you go to a chest, it will explode. The explosions cost about 500 damage, and it can be annoying because it adds up as you look for more chests. Chests appear randomly, so there’s no set area you want to go for.

I have found that you can find many more chests on the wooden ramparts and beams on the walls and ceiling. I found three really close to each other when I started looking high up. These chests are not secluded to any one place in the tower, you need to look all over to find them.
Eventually, a Seirei will drop, and you can use it. Once you get it, you unlock Demon Slash at weapon mastery 75, and Raging Cuts at weapon mastery 125. This is the only weapon added in Update 1 that doesn’t require money or beating a boss. However, you need to be around level 515 to 850 to get to the Indomitable Fortress, so it’s not like it’s free and easy.
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