Need help with the Yellow and Blue boss in Deltarune Chapter 5? Find every trial answer, correct evidence, culprit, attack guide, and winning strategy.
If you are diving into the latest update, you already know how exciting the new areas are, but you have likely hit a major roadblock. The Yellow and Blue boss fight in Deltarune Chapter 5 brings a massive difficulty spike, mostly because it throws traditional combat completely out the window.
Instead of a standard turn-based RPG battle where you simply chip away at a health bar, you are suddenly thrown into a full-blown courtroom drama that feels more like playing Phoenix Wright: Ace Attorney than a Toby Fox game. You have to figure out how to match the right evidence to the right culprit, manage your party’s resources, and somehow do all of this while dodging intense bullet hell attacks. If you find yourself frantically looking for a walkthrough on Steam Community guides or asking your Discord servers for help, you aren’t alone!
This comprehensive guide will break down the exact Yellow and Blue trial cases in Deltarune, show you how to survive their trickiest attack patterns, and even touch on that interesting Undertale Yellow reference everyone in the gaming community is talking about.
So, How Do the Trial Mechanics Work in This Boss Fight?
To get through this pacifist route encounter smoothly, you need to manage your resources completely differently than you did against bosses in previous chapters. Your main goal here is solving a mystery, which means your standard attack button is practically useless.
Here is a step-by-step breakdown of your new combat loop:
- Prioritize Defense and Grazing: Because you need a lot of magic to progress, spend your early turns having everyone Defend. If you are comfortable with the bullet patterns, intentionally “graze” the enemy projectiles by moving your heart close to them without taking a hit to boost your meter faster.
- Build Your TP to 40%: You absolutely must reach 40% TP to use the Deltarune Chapter 5 Justice ACT. Once activated, Yellow will dramatically describe the current crime to the courtroom, officially kicking off the trial phase.
- Play it Safe with HelpOut: If you are struggling to build your meter through grazing, rely on the HelpOut ACT with Susie and Ralsei. This is the safest, most consistent way to rack up TP quickly without taking unnecessary risks.
- Learn from Mistakes: If you pick the wrong answer during a trial, do not panic. The game is quite forgiving and will actually tell you whether you got the evidence or the culprit correct. You can use this exact feedback as a massive hint for your next turn!
Important Tip: You are inevitably going to take some damage while figuring out this puzzle. Always keep a little bit of TP in reserve so you can easily use Ralsei’s healing spells to keep your party in fighting shape for the next round.
What Should You Do When You’re Missing Key Evidence?
Sometimes, you will try to trigger the Justice ACT, but you’ll get a frustrating message saying you don’t feel like you have enough evidence yet. This usually happens around the later cases if you missed picking up clues while exploring the Flower Kingdom or the Flower Castle earlier in your run.
When this happens, you do not need to restart your save file or backtrack for hours. Simply follow these steps:
- Wait for your turn and open the ACT menu.
- Select the Evidence ACT on Blue.
- Spend the 20% TP required for the move.
Important Tip: Once you use this ACT, Blue will officially hand over whatever missing items you need to continue the trials. For example, if you are missing the BlueString for the final case, asking Blue for more evidence is the only guaranteed way to get it successfully added to your inventory!
The Exact Culprits and Clues: All Deltarune Chapter 5 Yellow Boss Fight Answers
Once you trigger a trial, your menu will change. You need to match the specific crime with one of the suspects from the 7 Colored Flowers and present the correct item to prove their guilt.
To save you the headache of trial and error, here are the exact solutions for all four courtroom cases:
- Case 1 (The Crushed Floradinn): Navigate to your suspect list, accuse Seth, and present the PerpBook as your undeniable proof.
- Case 2 (The Vandalized Jet-Black Shirt): When Yellow complains about their favorite shirt being ruined, accuse Green and present the YellowShred.
- Case 3 (The Stolen Handkerchief): This one is tricky. Accuse Aqua and present the RedSplatter.
- Case 4 (The Missing Secret Petals): For the final dramatic reveal, accuse Blue and present the BlueString.
Important Tip: During Case 3, a lot of players naturally try to present the Knife as evidence because it seems like the most obvious weapon. This is a trap! The RedSplatter is the only correct answer to safely progress past Aqua’s trial.
Keeping Your Party Alive: How to Dodge Yellow and Blue Attacks
Between your intense courtroom sessions, you still need to survive. Knowing how to dodge Yellow and Blue attacks is critical, as their bullet hell patterns can completely wipe your party out before you even get a chance to present your meticulously gathered evidence.
How to Weave Through the Flower Petal Blasters
Their most common attack features a blue-dotted line that transforms into a flower, rapidly firing out bullet petals. The trick here is to never stay completely still. Keep your heart moving constantly and look for the wider gaps in the petal streams. Focus your eyes on the center of the box rather than the edges so you can properly anticipate where the projectiles will intersect.
Slipping Past the Chaotic Musical Notes
When wavy music lines appear on your screen, things get chaotic fast. You need to carefully thread your heart horizontally through these waves. However, you must keep your peripheral vision on the top and bottom of the screen. Flowers will spawn on the edges and rain petals down on you, so prioritize short, controlled vertical movements to slip past the falling debris while staying between the music lines.
Finding the Rhythm to Survive the Jumping Ballerinas
During this phase, small ballerinas march across the bottom of the bullet box in a steady rhythm. The pattern is always exactly the same: every alternating ballerina will jump up into the air. Position your heart safely between two of them. As soon as you see the ballerina next to you crouch down, quickly shift your heart to the side to avoid the incoming jump. Once you find the rhythm, this becomes the easiest attack to survive.
Important Tip: If you make a movement mistake and Susie or Ralsei goes down, immediately use Blue’s Integrity ACT. It costs TP, but it will instantly revive any downed party members so you aren’t fighting short-handed.
We Have to Ask: Is This an Intentional Undertale Yellow Reference?
Once you clear the trials, you might find yourself wondering about the deeper lore behind this encounter. The community on Reddit and X (Twitter) is actively debating whether the Undertale Yellow reference in Deltarune is a fun, intentional easter egg or something more deeply tied to the game’s core story.
Given Yellow’s distinct cowboy motif and absolute obsession with the law, it perfectly mirrors the yellow “Justice” soul trait from the original Undertale. While a massive portion of the fanbase thinks Toby Fox is giving a direct nod to the wildly popular fan game, others believe he is simply expanding on the core soul lore he established years ago.
Either way, the attention to detail is staggering. Discovering the Deltarune Chapter 5 Yellow secret dialogue by carefully protecting Blue’s flowers earlier in the chapter shows just how much depth and heart these new characters have.
Getting past the Yellow and Blue courtroom battle is a massive relief and completely opens up the rest of your journey toward the Dark Fountain. Take a deep breath, heal your party at the nearest save point, and get ready for whatever Chapter 5 throws at you next!
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