Seriko Snap Seeds are incredibly useful if you want to kill Lady Butterfly in Hirata Estate, one of the more annoying Sekiro bosses. You'll have to know where to find them of course, and how to use them. But if you're having trouble with the Lady, this might well be exactly what you need in Sekiro.
There's a little discussion around the whole thing - some high level Sekiro players think they don't really make that much difference and aren't necessary. But if you're not a high level Sekiro player you probably want all the help you can get. So to that end, here are all the Seriko Snap Seed locations in the game and how to best use them.
Where can you find Sekiro Snap Seeds?
You will get one Sekiro Snap Seed from an NPC on your way into the Lady Butterfly boss fight, but the main place to pick them up in the early game is during the Great Serpent sneaking mission - when you’re creeping through the bushes, hide in the small tent after the ice wall you hug and stab the snake. This will drop multiple seeds in the area that you can go back to and pick up. Simply look for the glowing item icon next to the little hut where you stabbed him. Five should be more than enough for your troubles, but you can also pick some up in Mibu Village from the vendor next to the idol, but that is way late in the game. Useful if you haven’t beaten Lady Butterfly by that point though.
Outside of that, you can grab one or two in the Bodhisvatta Valley where the Toxic Mob vendor is staying, as well as a pack of two below you after the Sunken Valley Passage idol in the Gun Fort. When you beat the late-game boss True Corrupted Monk you’ll be able to buy them from every vendor, so if you really want to stock up for your next playthrough, you’re sorted!
What do Sekiro Snap Seeds do?
The main reason you need Sekiro Snap Seeds is to get rid of illusion techniques. Lady Butterfly will summon hordes of ghost soldiers in her second phase, making everything much more difficult than it needs to be. If you pop a Snap Seed when they’re skulking about, those in an AOE around Sekiro will disappear. It’s really only useful when you feel fairly safe, as it forces you into an animation that Ms Butterfly can capitalize on. Be careful.
Outside of that, you can use it on the Corrupted Monk boss in Mibu Village to stun him, as he is a phantom. Similarly, it has effects on late-game apparition enemies if you’re really struggling.