If you’ve spent any time grinding late-game Infinity Nikki stages, you’ve almost certainly run into the roadblock that is the Banshee boss fight. I spent three whole afternoons wiping on this fight last week, trying every outfit combo I had unlocked before I finally cracked the code that let me win without burning through all my healing items. Figuring out how to defeat the Banshee Infinity Nikki isn’t about having the rarest outfits in your closet—it’s about matching the right stats to her unique mechanics and timing your skills correctly. This guide breaks down everything I learned from my dozens of attempts, so you don’t have to waste hours repeating my mistakes.
Key Mechanics to Know Before You Try to Defeat the Banshee Infinity Nikki
The Banshee has two distinct combat phases, and understanding how each works will save you from a lot of frustrating one-shot kills. First, her core weakness is Bright attribute outfits—any Bright gear you wear will deal 15% extra damage per piece, and reduce the damage she deals to you by 10% per piece. On the flip side, she ignores 30% of all Cool attribute defense stats, so don’t waste slots on your go-to Cool stage outfits even if their overall star rating is higher.
Every attack she lands applies a Despair debuff that stacks up to 5 times. At 5 stacks, you’ll be instantly knocked out no matter how much HP you have left, so you need to keep a close eye on your debuff bar throughout the fight. She also has a 10-second stun window after her big full-arena AoE attack, which is the only safe time to use all your high-damage skills. I didn’t notice this stun window for my first 10 runs, so I was constantly missing out on free damage and wasting skills when she was moving too fast to hit reliably.
Optimal Outfit Build for the Banshee Boss Fight
You don’t need 5-star limited gacha outfits to clear this fight—my first clear was with a mix of 3-star and 4-star Bright gear I earned from story stages. Your stat priority should be: Debuff Resistance first, Healing Effectiveness second, and Bright Attack Power third. Even if you don’t have any of the listed items, you can still figure out how to defeat the Banshee Infinity Nikki with common Bright attribute drops you get from early story stages.
If you have these items in your collection, they’ll make the fight exponentially easier:
- Glowing Moon Hairpin: Gives 20% debuff resistance and 10% extra Bright attribute damage for the entire fight, no activation required
- Sunset Silk Gown: Boosts healing item effectiveness by 35% when you’re at less than 50% HP, which is perfect for surviving phase 2’s heavy burst damage
- Luminous Anklet: Triggers a 2-second invincibility shield every time you take a Despair stack, which lets you dodge her follow-up AoE attacks without using your main shield skill
Aim for at least 35% Debuff Resistance with your full build. That slows down Despair stack buildup by 35%, giving you way more time to use cleansing items before you hit the 5-stack one-shot threshold. If you can’t hit 35%, 30% is still workable, you’ll just have to be more careful about tracking your debuff stacks.
Phase-by-Phase Fight Walkthrough
Phase 1 runs from 100% to 50% of the Banshee’s HP, and it’s designed to test your dodging skills more than your damage output. She uses three consecutive ranged scream blasts every 8 seconds, and you can dodge each one by moving left or right immediately after you see her raise her hand to her mouth. Don’t use any of your offensive skills in phase 1—save them all for phase 2 when she’s more vulnerable and you have guaranteed stun windows to land hits.
Right before she hits 50% HP, make sure you’re at full health and your shield skill is off cooldown. She opens phase 2 with a full-arena wail that deals 70% of your max HP as damage, so if you’re already low you’ll get knocked out instantly. If you time your shield skill right for that first phase 2 AoE, you’re already 80% of the way to knowing how to defeat the Banshee Infinity Nikki.
In phase 2, she alternates between fast melee swipes that hit the area directly in front of her, and charged wails that hit a 180-degree arc in front of her. Stay at her side at all times to avoid both of these attacks easily. Every three attacks, she’ll use that full-arena AoE again, so make sure your shield skill is off cooldown each time. After that AoE, she’s stunned for 10 seconds—use all your offensive skills and damage items during that window to burn through her remaining HP as fast as possible.
Common Mistakes That Make the Banshee Fight Harder
The biggest mistake I see new players make is running Cool attribute outfits because they have higher overall stats. Even a 5-star Cool outfit will deal 40% less damage to the Banshee than a 3-star Bright outfit, and you’ll take 20% more damage, so it’s never worth the tradeoff. I made this mistake for my first 5 runs, and I was getting one-shot at 2 Despair stacks half the time before I swapped to my Bright gear.
Another common mistake is wasting Cleansing Potions on low Despair stacks. You only get two Cleansing Potions per fight, so only use them when you hit 4 stacks. If you use them at 2 or 3 stacks, you’ll run out right when you need them most in late phase 2. Avoiding these small errors will cut your learning curve in half when you’re figuring out how to defeat the Banshee Infinity Nikki.
You also don’t want to run too far away from her in phase 2. If you’re more than 10 feet away, she’ll spam fast ranged scream attacks that are way harder to dodge than her melee swipes. Stay within 5 feet of her side at all times, and you’ll avoid 90% of her attacks without even trying. If you do have to move away to heal, get back to her side as quickly as possible to avoid the ranged spam.
At the end of the day, learning how to defeat the Banshee Infinity Nikki is way more about understanding her mechanics than it is about having top-tier rare outfits. I’ve seen players clear this fight with full 3-star Bright outfits just by following the steps above, so don’t get discouraged if your first few attempts don’t go well. Take note of what’s causing you to wipe, adjust your build or your timing, and you’ll get that win sooner than you think. Once you beat her, you unlock the exclusive Wailing Melody outfit set that’s perfect for all future Dark attribute boss fights, so the effort is 100% worth it.