The Short Version: Knuckle Duckle's your straightforward Electro-Charged playground, while Radiant Moonfly throws debuffs at you like confetti. Pick based on who you're building: Knuckle Duckle feeds Flins and Aino, Radiant Moonfly's all about Lauma.
So Nod-Krai dropped two new world bosses on us, and honestly? They couldn't be more different if they tried. Both'll cost you 40 Original Resin per run (because of course they will), but that's where the similarities end.
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Finding These Things (And Why Location Matters)
Knuckle Duckle lives in a cave south of that Clink-Clank Krumkake Craftshop on Lempo Isle.
From Nasha Town, head northwest to the craft shop, then look for the cave across from the pier. Pretty straightforward once you know where you're going.
Radiant Moonfly decided to be more mysterious - it's tucked away near Blue Amber Lake.
Take the northern route from Nasha Town, hug the lake's eastern edge toward Nothing Passage. There's an underground waypoint that'll save your sanity later.
Pro tip: Unlock that Statue of the New Moon in Lempo Isle first. Trust me on this one.
The Actual Fights (Where Things Get Interesting)
Knuckle Duckle packs 5.6 million HP and hits for nearly 15k ATK. Here's the kicker - it goes into Duckstruction Mode with 80% universal resistance.
Sounds terrible, right?
Not really. It spawns five Ducks that have 90% Hydro resistance but only 10% Electro resistance. The strategy? Ignore the boss completely and Electro-Charge those ducks to death. Ten reactions later, that armor's gone. The purple ground markers telegraph everything, so it's actually pretty forgiving once you get the rhythm.
Radiant Moonfly is... well, it's a different beast entirely. Lower HP at 3.3 million, but it hits harder (19.7k ATK) and has this absolutely brutal debuff system. We're talking 40% less damage dealt, 40% less healing, 100% less Crit Rate, plus constant HP drain.
But here's the twist - if you can cleanse that debuff at full HP, you get +15% Crit Rate and +50% damage. It's risk-reward gameplay at its finest. The boss cycles through three forms: melee, Green Butterfly (ranged AOE spam), and Orange Butterfly (Pyro field central). Oh, and it resists Pyro and Dendro by 70%. Because why make things simple?
What You're Actually Farming For
Knuckle Duckle drops Precision Kuuvahki Stamping Die - that's what Flins (5-star Electro Polearm DPS) and Aino (free Hydro Claymore support) need. Both characters, completely different roles, same boss. Efficient? Absolutely.
Radiant Moonfly gives you Lightbearing Scale-Feather, but only Lauma (5-star Dendro Catalyst) wants it. Single-character specialization - classic HoYo move.
The gem situation's interesting though. Knuckle Duckle's Electro-only (Vajrada Amethyst), while Radiant Moonfly drops both Dendro and Pyro gems. If you're building multiple element characters, that dual-drop's actually pretty valuable.
You'll need 46 materials total for full ascension (1-90), which translates to roughly 16-23 boss runs. Yeah, it's a grind.
Team Building (The Real Talk)
Knuckle Duckle Strategy
Forget the boss exists during shield phases. Those Ducks are your only target - each one you kill takes 5% off the boss's HP anyway.
My go-to team? Raiden Shogun, Yelan, Kazuha, Furina. Consistent Electro-Charged, solid damage, reliable clears in 2-3 minutes. If you've got Flins, try Flins/Ineffa/Yelan/Kokomi for those new Lunar-Charged reactions.
Budget version works fine too: Fischl, Barbara, any DPS, Sucrose. The mechanics don't change.
Radiant Moonfly Strategy
This one demands respect. You need a dedicated healer - not negotiable. Kokomi, Baizhu, Jean, someone who can actually keep you alive through that debuff.
The strategy's counterintuitive: accept the debuff, then burst heal to full for that damage window. Nilou/Lauma/Kokomi/Nahida works beautifully for Lunar-Bloom teams. Alternatively, Raiden/Yelan/Nahida/Baizhu if you prefer Hyperbloom.
Just... don't bring Pyro or Dendro DPS. That 70% resistance isn't a suggestion. Clear times run 4-6 minutes, which honestly isn't bad considering the complexity.
The Resin Math (Because We All Care)
Both bosses need 640-920 Resin for complete character ascension, assuming 2-3 materials per run. Add another 7+ million Mora for talents and leveling.
My priority ranking? Flins first (meta DPS potential), then Aino (free character, solid utility), then Lauma (Dendro specialist for specific teams).
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What Not to Do (Learn From My Mistakes)
Don't attack Knuckle Duckle during armor phases. That 80% resistance isn't kidding around.
Don't completely avoid Radiant Moonfly's debuff - you're missing damage buff opportunities.
Don't farm materials before you actually have the character. I've seen too many people with 50+ boss materials and no character to use them on.
Seriously, don't bring Pyro DPS to Radiant Moonfly. I tried. It hurt.
Quick Answers to Common Questions
New player friendly? Knuckle Duckle wins here. Simpler mechanics, 4-star teams work fine, and you get materials for both a premium and free character.
Drop rates? Identical at 2-3 materials per run (WL8). Radiant Moonfly's dual elemental gems give it slight edge for roster diversity.
Minimum investment? Knuckle Duckle just needs Electro + Hydro. Radiant Moonfly demands that dedicated healer plus non-Pyro/Dendro DPS.
Total cost? 46 boss materials (16-23 runs) plus 7+ million Mora for complete character development.
Solo viable? Absolutely. Both are designed for solo play with proper team comp.
Long-term value? Knuckle Duckle edges out with two-character support versus Radiant Moonfly's single-character focus.
The bottom line? If you want straightforward farming with flexible team options, go Knuckle Duckle. If you enjoy complex mechanics and have strong healing options, Radiant Moonfly's your challenge. Either way, you're looking at weeks of farming - plan accordingly.