DELTARUNE Jevil Guide: How to Unlock & Beat Chapter 1's Secret Boss

Jevil. The insane, cackling jester locked away beneath Card Castle is the ultimate challenge in DELTARUNE Chapter 1. He is a high-speed, bullet-hell nightmare who lives up to his catchphrase: "I can do anything!"

If you've found the King too easy and are looking for a challenge that will truly test your DETERMINATION, then Jevil is your target. This guide from Cartpitol.com will walk you through every step, from finding the Broken Keys to mastering his chaotic Final Chaos attack.

Jevil, the secret boss of DELTARUNE Chapter 1, cackling in his prison cell

1. How to Unlock the Jevil Fight (Step-by-Step Guide)

To unlock Jevil's cell, you must find three broken key pieces and take them to a smith for repair.

Step 1: Find Jevil and Get the First Key

Locate the Cell: In Card Castle, take the main elevator to 1F (First Floor).
Exit and find the smaller, hidden elevator in the southeast corner. Select the "?????? " floor.
Descend the stairs and approach the prison cell to meet Jevil. Talk to him until he asks you to free him.
Get Key Piece A: Travel to Seam's Shop in the Field area. Speak to the shopkeeper, Seam, and choose the dialogue option about the "Strange Prisoner" to receive Broken Key A.

Step 2: Find Broken Key B (The Secret Path)

Go to the Forest: Head to the Forest area, past the Bake Sale, where you encountered the enemies known as Hathy (Heart Squares).
Find the Hidden Area: Continue until you reach the area with the Black/White Paper Dancers. Go to the section just before the south exit where you fought Bloxers.
Walk South: In the lower-right area of this section, press against the bottom wall to find a hidden passage leading south. Walk through the invisible path until you find a chest containing Broken Key B.

Step 3: Find Broken Key C (The Puzzle Solution)

Go to the Field Puzzle: Travel to the large diamond/spade puzzle that you solved earlier in the chapter, located before the Card Castle.
Input the Solution: Approach the puzzle board and set the combination to the order of the card suits: Diamond, Heart, Club, Spade.
- (Note: This combination is found by observing the shaped doors in the Card Castle floors.)
A gate will open, allowing you to access a chest containing Broken Key C.

Step 4: Repair the Key

Go to Malius the Smith: Travel to the Bake Sale area in the Forest. Head north to find Smith Malius.
Speak to Malius and select the option to "Fix an item." He will combine the three broken pieces into the Jail Key.

Step 5: Start the Fight

Return to the Card Castle, go to the "?????? " floor, and use the Jail Key on Jevil's cell door to begin the boss fight!

The three broken key fragments (A, B, and C) used to create the Jail Key to unlock Jevil's cell

2. Jevil's Battle Mechanics: Pacifist vs. Violence

Jevil can be defeated in two ways, each yielding a unique, powerful reward. Both routes require expert bullet dodging, but the strategies differ significantly.

Route	Goal	Key Action	TP Cost
Pacifist (Mercy)	Increase Jevil's Tiredness until he can be Pacified.	Hypnosis (50% TP) & Pirouette (20% TP)	High
Violence (Fight)	Deplete Jevil's HP (approx. 3500-5000 HP) through attacks.	Rude Buster (Susie) & SpookySword (Kris)	Medium

Strategy A: Pacifist Route (The Hypnosis Method)

This route relies on Ralsei's magic to tire Jevil out. You need to use a combination of Hypnosis and Pirouette until his name turns blue (indicating maximum Tiredness).

Turn	Kris	Susie	Ralsei	Goal
Turns 1-5	Defend	Defend	Hypnosis or Pirouette	Build Tiredness while conserving TP.
Turns 6-11	Defend	Defend/Heal	Hypnosis	Hypnosis costs 50% TP, so you must graze Jevil's attacks to keep your TP high.
Turns 12-16	Defend	Defend/Heal	Pirouette	Use Pirouette when Hypnosis isn't ready. Be aware of Pirouette's random effects (it's actually based on turn number, but can be dangerous!).
Final Turn	Defend	Defend	Pacify (Once Jevil is Tired)	Once his name is blue, use the Pacify command for the win.

Recommended Gear (Pacifist):

Ralsei: Dainty Scarf (Increases Heal Prayer effectiveness).
Armor: Equip Amber Cards and the White Ribbon (for Ralsei) or Iron Shackle (for Kris/Susie) to maximize Defense and Magic.
Items: Stock up on ReviveMints, Spin Cakes, and Darkburgers.

Strategy B: Violence Route (The Rude Buster Method)

This route is simpler in action but requires better dodging, as you won't use Ralsei's turn to reduce Jevil's damage.

Attack Constantly: Focus Kris on Attack and Susie on using Rude Buster (requires 50% TP, reduced by the Devilsknife reward).
Ralsei as TP Battery: Use Ralsei to Heal (if necessary) or Defend to build TP for Susie.
Prioritize Dodging: Since the fight won't end until Jevil's HP is zero, you must treat every attack as a threat.
The End: Continue attacking until Jevil's HP is depleted for the win.

Recommended Gear (Violence):

Susie: Brave Axe or the eventual Devilsknife (for Rude Buster discount).
Kris: SpookySword.
Armor: Focus on the highest ATK and DEF stats available from items like the Iron Shackle and Amber Cards.

3. Mastering the Attacks: Jevil's Moveset

Jevil's attacks are fast and numerous. The key to surviving is recognizing the pattern titles he gives:

Jevil's Hint	Attack Description	Dodging Strategy
"Catch me if you can!"	Fast-moving Spades fired from random directions.	Stay near the center and move slowly to react quickly to the incoming projectiles.
"Let's make the Devilsknife!"	His signature scythe attacks, which rotate and split into pieces.	Find the "hole" in the formation (usually near the top) and follow it as it moves around the perimeter of the box.
"Let's ride the carousel game!"	Ducks/horses move along a sine wave pattern, either horizontally or vertically.	Stay in the middle and move minimally, or hug the edges of the box and move with the pattern.
"My hearts go out to all the sinners!"	Spinning Heart projectiles fly across the screen, sometimes in square formations.	Focus on the position of your SOUL, not the individual hearts. Use small, precise movements to avoid collision.
"The true and real chaos!"	Final Chaos Attack. Jevil's most difficult, screen-filling attack.	This attack cycle is always the same. Practice this specific sequence until it becomes muscle memory. Stay calm!

4. The Rewards: Jevilstail vs. Devilsknife

Your final reward depends on your method of victory, and the choice is permanent for the rest of the game.

Reward	Method	Type	Stats / Effect	Best Used For...
Jevilstail	Pacify	Armor (Equippable by ALL)	+2 ATK, +2 DEF, +2 MAG	Pacifist runs, Ralsei/Noelle magic builds, and general utility across the party.
Devilsknife	Fight	Weapon (Susie ONLY)	+5 ATK, +4 MAG, -10% Rude Buster TP Cost	Violence runs, maximizing Susie's damage output, and making Rude Buster more affordable.

Celebrate Your Victory Over Chaos!

Whether you Pacified the Jester with kindness or defeated him with raw power, you have conquered the hardest challenge in DELTARUNE Chapter 1. That level of dedication and skill deserves recognition!

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Conclusion

The Jevil fight is more than just a battle; it's a rite of passage for every DELTARUNE player. By learning his patterns, optimizing your gear, and choosing your route carefully, you can overcome the master of chaos. Now that you've secured your powerful reward, you're better prepared than ever for the challenges that Chapters 3 & 4 have unleashed!