Deltarune Chapter 5: Yellow & Blue Boss Guide

Deltarune Chapter 5 has a few boss duos that you face, mostly in the final section when you're in Flower Castle. Yellow and Blue are the pairing that you fight before you head to the top of Flower Castle, and their fight takes place on the left side of the castle. So, you usually complete the right side where the café is for the sake of having a shop, then move to the left side in order to clear the hedges in front of the large door.

First, you go through some platforming as you follow Yellow. Then, you meet Blue and end up on trial for fooling Yellow. However, before you can win the boss fight with this duo, you need to gather the correct pieces of evidence, because the trial you're part of for fooling Yellow is the boss fight, and evidence is going to be your weapon.

Gathering Evidence

Before you even start the fight, you need to pick up some specific items while following Yellow that will act as evidence in the trial. You need three pieces, but you might end up with more than that if you interact with everything or follow my complete guide for Chapter 5.

When you enter the Yellow room for the first time and Yellow's dialog is over, go all the way to the left of the path and pick up the Yellow Shred that's sitting near the unlit campfire. Next, go up, all the way to the right where you find another Yellow door, and then down to interact with the hat on the ground. Yellow will join you in digging a hole in search for himself. This leads to him opening the second Yellow door, which lets you follow him into the next area.

Right after entering the door, you find Aqua and Seth. In front of Seth, there's a book on the ground. It's the Purple Book, and you need this as evidence in the upcoming trial. Here, Aqua leaves to help Yellow, and you have to go through more platforming sections to reach them. Once you find them, you'll need to destroy the big gun while dodging knives, leading to Yellow throwing himself into jail.

Now, it's time to meet Blue, by continuing to the left. Then, you'll follow him back through Yellow's section, which leads back to the Yellow-shaped hole you dug. There's now a bunch of red in the hole. After Blue leaves, interact with it to get the last piece of evidence you need for the trial: Red Splatter.

Yellow and Blue Trial Fight

Time to face justice. Leave the Yellow room following Blue and enter the now-open Blue door. Continue through the second Blue door, and you find yourself in the jail where Yellow is. After a cutscene, you start the boss fight with Yellow and Blue.

Dealing damage is pointless, so I use defend and dodge the bullet patterns until I have at least 40% TP. Then, use ACT on Yellow and pick Justice to begin a trial. You have to solve four cases correctly to win the battle. Each case will have the victim state the crime committed against them, then you pick the culprit from a lineup and choose the piece of evidence that proves their guilt. Here's the correct sequence of choices that wins the fight:

1. The Floradinn was crushed: Accuse Seth with the Purple Book as evidence.
2. Yellow's shirt has been partially destroyed: Accuse Green with the Yellow Shred as evidence.
3. Green's handkerchief was stolen: Accuse Aqua with the Red Splatter as evidence.
4. You've run out of evidence. ACT on Blue to get the Blue String.
5. Yellow's special petals are missing: Accuse Blue with the Blue String as evidence.

After accusing Blue, the fight ends with a cutscene. Now, you're able to reach the scissors and cut the hedge on the left that's blocking the big door in the foyer, allowing you to move forward in Deltarune.

Systems

Released October 31, 2018

ESRB Teen / Language, Suggestive Themes, Mild Blood, Fantasy Violence

Engine gamemaker

Prequel(s) Undertale

Number of Players Single-player