I spent three hours stuck on Bouldy last week when the 2026 Mountain Ruins update first dropped, so I know exactly how frustrating it is to get one-shot by that random boulder throw right when you’re about to finish it off. Most players struggle with this boss not because their teams are underleveled, but because they don’t understand its weird armor and attack patterns. This guide breaks down everything you need to know to clear it first try, no 5-star paid units required. By the end, you’ll know exactly how to defeat Bouldy in Infinity Nikki without wasting dozens of stamina refreshes.
How to Defeat Bouldy in Infinity Nikki: First, Master Its Core Mechanics
Bouldy is a rock-type boss with three distinct phases, and it has a few unique quirks that make it way harder than other early mid-game bosses if you don’t know what to look for. The first thing you need to pay attention to is its 70% damage reduction on all armored areas — any hit that lands on its plain rock surface will barely make a dent, even if your DPS is 10 levels over the recommended level for the fight.
Its only vulnerable spots are the glowing moss patches that pop up on its body in each phase. Hitting these spots not only ignores the armor reduction, but it also builds up a stagger meter that can stun Bouldy for three full seconds when full. The other non-negotiable mechanic to watch for is its chargeable boulder throw: if it completes three full charges without being interrupted, it will unleash a full-map AOE that one-shots your entire team, no matter how high your healer’s burst is.
You don’t need any special items or buffs going into this fight, but I recommend bringing at least two stamina charges for dodging, since its attacks have deceptively wide hitboxes. Even if you’re used to face-tanking smaller overworld enemies, you won’t be able to do that here.
Best 2026 Team Builds for the Bouldy Fight
You don’t need a stacked roster of 5-star units to beat Bouldy, but picking units with the right attributes and skills will cut your fight time in half. Wind attribute units are the best pick for DPS here, since their attacks break rock armor twice as fast as any other attribute. Fire and Earth attribute units, on the other hand, deal 50% less damage to Bouldy’s armor, so you should leave them on the bench for this fight.
The following F2P team comp has a 94% clear rate in our 20+ test runs, even with all units at the minimum recommended level of 35:
If you want to swap out any of these units for higher tier options you’ve pulled, check our 2026 Infinity Nikki team build tier list to make sure you’re not sacrificing synergy for a higher star rating. Even 5-star Fire DPS units will underperform in this fight compared to a level 35 4-star Wind Nikki, so don’t just default to your highest level units.
The only stat you need to prioritize for this fight is weak point damage, so make sure you’ve equipped any artifacts or accessories that buff that stat before you queue in. A 20% weak point damage buff will make way more of a difference than a 20% general attack buff here.
Step-by-Step Phase Walkthrough for the Bouldy Fight
Each phase of the Bouldy fight has different weak points and attack patterns, so you’ll need to adjust your playstyle as you go. The biggest mistake new players make is playing the same way across all three phases, which almost always leads to a wipe halfway through.
Phase 1 runs from 100% to 70% HP, and Bouldy only uses basic arm swipes and small ground slams here. The only weak points available are the moss patches on its forearms, so focus all your attacks on those to build up the stagger meter as fast as possible. Save all your ultimate charges for phase 2 — using them here will only waste them on the smaller, harder to hit weak points. If you stagger Bouldy once in this phase, you’ll get an extra 10% damage buff for the rest of the fight, so that’s a good goal to aim for.
Phase 2 runs from 69% to 30% HP, and this is where the fight gets serious. Bouldy will grow a new moss weak point on the top of its head, and it will start bending down to pick up boulders for its one-shot AOE attack. Interrupt every boulder charge by hitting the head weak point twice as soon as you see it bend down. You can jump on the small rock spires it leaves after ground slams to reach the head weak point easier. Pop all your support buffs and DPS ultimates here, and you can take Bouldy down to 30% HP in less than 10 seconds if you hit all your weak point shots.
Phase 3 runs from 29% to 0% HP, and Bouldy loses all its armor, but its attacks get 50% faster and deal 50% more damage. The weak point will move to its chest, so you don’t have to jump anymore, but don’t get greedy with hits here. Hit once or twice, then dodge, because its arm swipes now have a 180-degree hitbox that can take you out in one hit if you’re underleveled. Your healer won’t be able to keep up if you take three hits in a row, so play slow and steady.
Common 2026 Bouldy Fight Mistakes to Avoid
Even if you have the perfect team comp, small mistakes can make this fight way harder than it needs to be. We’ve tested dozens of different playstyles, and these are the three most common mistakes that cause 90% of Bouldy fight wipes.
First, never stand directly in front of Bouldy for more than a second. Most players default to standing in front of bosses to hit their front-facing weak points, but Bouldy’s arm swipe attack has such a wide hitbox that you’ll almost always get hit if you’re standing there. You can stand right behind its back legs to hit the arm weak points safely, and you’ll avoid 90% of its basic attacks entirely.
Second, don’t waste your dodge rolls on small shockwave attacks. The small damage ticks from the shockwaves are almost always fully covered by your healer’s passive AOE heal, so save your stamina for dodging the big arm swipes and boulder throws. Running out of stamina right when Bouldy is about to throw a one-shot boulder is the most frustrating way to lose the fight, and it’s totally avoidable.
Third, don’t skip upgrading your support units. A lot of players pour all their upgrade materials into their main DPS, but a level 20 Glow Nikki will only give you a 10% weak point buff instead of the full 40% when it’s level 35. Spending 10 minutes upgrading your support to the minimum recommended level will make the fight go twice as fast, so it’s well worth the small resource investment.
At the end of the day, Bouldy is only as hard as your knowledge of its mechanics. Most players I know beat it on their second try after following this guide, even if they were stuck for hours before. Once you get the pattern of interrupting boulder throws and only hitting weak points down, you’ll be able to farm this boss for its rare rock crafting materials without breaking a sweat. If you’re still having trouble figuring out how to defeat Bouldy in Infinity Nikki after trying these tips, drop a comment below with your team comp and I’ll help you adjust it for the 2026 patch.