If you're hunting for Primogems in 2026 and want a real combat workout, the Frost Moon Local Legends in Genshin Impact are absolutely worth your time. Hidden in Ungien's Circle, Prism Slime and Mushteshir are two bosses that can seriously test your mettle—and your team comp. After wrapping up the Pioneer Quest, I tracked these suckers down and bagged 120 Primogems across six achievements. Let me break down exactly how you can do the same, so you can snag those primos without pulling your hair out.
Getting Started: The Prerequisite
Before you even think about these fights, you need to have the Pioneer Quest under your belt. No way around it, buddy. Once that's done, the Lunar Highlands open up, and Ungien's Circle becomes accessible. From there, it's go-time.
Prism Slime: Location & How to Smash It
Prism Slime is hanging out in the southern part of Ungien's Circle. Getting there is a piece of cake if you follow these steps:
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Teleport to the southern Transit Station.
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Head southwest toward the Lunar Highlands waypoint.
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Hop on the southern Fast Transit Lane and jump off near that waypoint to unlock it.
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From the waypoint, just jog west and you'll find the shiny blob waiting for you.
The Fight Breakdown 🟢
Prism Slime has a nasty habit of entering a light-gathering mode that drags the fight out. The longer it takes, the more annoying it gets. You'll want to bring a DPS with massive burst potential—think characters who can delete things in one rotation. A well-timed Elemental Burst combo will make this fight a walk in the park.
Achievement Hunt 🎯
You can grab three achievements from this slimy rascal. The first one is a gimme—just defeating it unlocks something. The real challenge lies in the other two: you need to end the fight in two or fewer energy absorption phases. Yep, you heard right. If it gets to a third phase, you're out of luck. My advice? If you see it start that third absorption, bail out and reset the fight. No point wasting time.
Pro move: use a high-burst setup like Hu Tao, Raiden Shogun, or even a cracked-out Arlecchino team. Pop your buffs, unload, and watch it melt. Don't forget a shielder or healer if you're feeling squishy.
Mushteshir: Location & How to Shut It Down
Mushteshir is a whole different beast, tucked away in the Kalag Guarding Grounds inside Ungien's Circle. To reach this fella:
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Fast travel to the north-western waypoint in Ungien's Circle.
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Head northeast until you spot an entrance.
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Slip through the north-western passage just beyond a crack in the wall.
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Inside, you'll find a mechanism. Interact with it, then complete the intermediate and advanced validation stages. Finally, kick off the ultimate validation to summon Mushteshir.
Word to the wise: have your strongest team ready before triggering that ultimate validation. This fight is no joke—Mushteshir hits hard and has some trickery up its sleeve.
The Fight Mechanics & Cheesy Achievements 🧀
The secret to pinning down Mushteshir is all about its detection devices. When the fight starts, these little gadgets pop up and will activate a Suppression Field if you don't smash them fast. Your goal is to destroy all four detection devices before they trigger that field. Do that, and Mushteshir becomes paralyzed, leaving it wide open for you to go ham.
For the achievements, you need to pull off that paralysis. So focus fire on the devices the moment they appear. AoE and fast-hitting characters shine here—think Nilou bloom, Ayaka freeze, or a turbocharged Navia. Once it's stunned, dump all your burst damage and watch the HP bar vanish. If you miss even one device, the Suppression Field kicks in and you lose your shot. Don't be afraid to restart if things go south.
General Tips Before You Dive In ✅
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Team Check: Both bosses demand high burst damage. Don't skimp on a healer or shielder; getting one-shot is a mood killer.
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Achievement Reset: For Prism Slime, if it hits the third light-gathering phase, just restart. With Mushteshir, if a detection device survives, reset. No shame in the game.
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One-Time Rewards: These achievements are permanent, so you can take your sweet time. No FOMO here—work on them when your team is cooked and ready.
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Loot Breakdown: 120 Primogems total, plus Mora, talent materials, and some slime/iron drops. Not too shabby for a couple of boss fights.
Defeating the Frost Moon Local Legends is a rite of passage for any endgame player in 2026. With the right strategy and a little bit of grit, you'll be swimming in extra primos for that next character banner. Now get out there and show those legends who's boss!