If you’ve made it far enough in Deltarune Chapter 1 to unlock the hidden boss Jevil, congratulations—you’re about to face one of the toughest and most chaotic challenges in the game. Jevil isn’t your typical enemy. His erratic moves, unpredictable phases, and non-stop barrage of attacks make him a true test of patience, reflexes, and smart planning.
Whether you’re on a pacifist run or going all-out with brute force, this comprehensive guide will show you how to beat Jevil in Deltarune, what to bring, which tactics work best, and what rewards you’ll earn for defeating (or sparing) him.
Who Is Jevil in Deltarune?
Jevil is the secret boss of Chapter 1 in Deltarune, found in the hidden basement of Card Castle. He’s a jester-like figure whose insanity makes him unpredictable and dangerous. Thematically, he contrasts the rest of the game’s structure and throws logic out the window. If you’re expecting a clean, straightforward battle—think again.
He cycles through five different phases, each with increasingly difficult attacks. With around 3500 HP, he is a formidable opponent no matter which path you take. But defeating Jevil rewards you with powerful gear and a great sense of accomplishment.
How to Unlock the Jevil Battle
Before you can fight Jevil, you need to access his hidden cell:
- Collect the Key Fragments:
- Fragment A: Found in the Field Area by solving a puzzle involving clocks and buttons.
- Fragment B: Located in the Bake Sale Area.
- Fragment C: Acquired in the Card Castle, near the elevator to the throne room.
- Assemble the Key:
- Bring all three fragments to Seam (the shopkeeper) in the Field. He’ll forge the full key.
- Open the Door:
- Use the key to unlock the door in the basement of the Card Castle. This starts the Jevil encounter.
Now you’re ready to face him—but preparation is key.
Preparation: Best Items and Equipment to Bring
Jevil’s attacks are relentless, so entering his cell without solid healing items and proper gear is a recipe for disaster. Here’s what you need:
Essential Healing Items:
- Top Cake / Spin Cake: These restore your entire party’s HP. Save them for dire moments.
- Dark Burgers: Easily purchasable and offer a good HP boost for a single character.
- Revive Mints: Bring at least 2–3 in case someone gets KO’d mid-battle.
- Club Sandwich: Heals all party members for a decent amount—great in between big attacks.
Recommended Equipment:
- Ralsei: Equip magic-boosting items to increase healing potency.
- Kris and Susie: Focus on defense-boosting gear to minimize damage taken.
- Optional: Equip the Amber Card or Dice Brace if you want balanced defense.
Understanding Jevil’s Battle Phases
Jevil cycles through five phases, each more intense than the last. His attacks include:
- Spinning scythes
- Spade projectiles
- Spinning carousel wheels
- Meteor showers
- Teleportation effects and screen warps
Each phase introduces new combinations, but the attacks follow a semi-recognizable pattern after a few attempts. The more you practice, the easier it becomes to anticipate.
Option 1: Pacifist Route – Spare Jevil
If you want to end the fight peacefully, you must tire Jevil out and use Ralsei’s Pacify spell to put him to sleep.
Steps to Spare Jevil:
- Use Hypnosis: This is your main action. It requires 50 TP and all three party members. Hypnosis increases Jevil’s tiredness and lowers his attack for a few turns.
- Use Pirouette: This is Kris’s solo move that costs 20 TP. It raises tiredness slightly and causes random effects—sometimes helpful, sometimes chaotic.
- Defend Frequently: Build TP by using the Defend command with Susie or Ralsei. This also reduces damage taken.
- Heal Strategically: Save big heals (Top Cake, Spin Cake) for moments when your team is critically low. Use Dark Burgers or Club Sandwich when needed.
Final Steps:
Once Jevil is sufficiently tired, the Pacify spell becomes available. Time it correctly, and the battle ends immediately with you sparing Jevil.
Option 2: Attack Route – Defeat Jevil
Prefer to go head-to-head and whittle down his 3500 HP? Here’s how to win through brute strength.
Steps to Defeat Jevil:
- Susie’s Rude Buster: This magic-based attack is your strongest offensive option. Use it as often as you have 50 TP.
- Kris: Focus on regular attacks to build steady damage.
- Ralsei: Alternate between Defend and Heal Prayer. Use your TP wisely—don’t waste it on attacks from Ralsei.
- Manage Items: Between TP attacks, make sure to use healing items regularly. A well-timed Revive Mint can turn the tide.
Key Tip:
Jevil’s attacks get harder as his HP drops. Don’t let your guard down in the last phase—he’ll use his most chaotic patterns when he’s almost defeated.
Jevil’s Hardest Attacks and How to Dodge Them
Dodging Jevil’s attacks is the hardest part of the battle. Here are the most difficult moves and tips to avoid them:
1. Carousel Attack:
Circular saws spin across the screen.
- Tip: Stay in between the spinning blades and move clockwise or counter-clockwise as needed.
2. Spade Bombs:
Large bombs fall from the top of the screen.
- Tip: Move quickly and diagonally. Don’t stay in one place.
3. “I Can Do Anything!” Attack:
Randomized attacks fill the screen rapidly.
- Tip: This one is hard to predict. Learn from each attempt and adjust your position constantly.
4. Card Rain:
Spinning cards flood the screen.
- Tip: Stick to the edges and watch their pattern. Sometimes it’s easier to weave through the middle.
The key to survival is pattern recognition. The more you fight him, the better you’ll get at avoiding damage.
Best Battle Tips for Success
- Don’t Rush the Fight: Take your time. Play defensively and don’t try to end it quickly.
- Use TP Efficiently: Only use TP for Hypnosis, Rude Buster, or healing. Don’t waste it on ineffective actions.
- Practice Makes Perfect: You might not beat Jevil the first few times—and that’s okay. Treat each attempt as practice.
Jevil’s Rewards: What You Get After Winning
Depending on how you handle Jevil, you’ll get one of two powerful rewards:
Spare Jevil (Pacifist Route):
- Reward: Jevilstail
- A powerful piece of armor that boosts attack, defense, and magic stats.
- Best used on any character to increase overall stats, especially in later chapters.
Defeat Jevil (Attack Route):
- Reward: Devilsknife
- A high-damage weapon exclusive to Susie.
- Boosts attack significantly and slightly increases magic.
Which Reward Should You Choose?
It depends on your playstyle:
- If you like defense and balanced stats: Go with Jevilstail.
- If Susie is your primary attacker: Choose the Devilsknife.
Either way, both items are incredibly useful and worth the effort. You can only pick one per save file, so choose wisely.
Final Thoughts: Is It Worth Fighting Jevil?
Absolutely. While Jevil is an optional boss, he offers one of the most engaging and memorable battles in Deltarune Chapter 1. His dialogue, design, and unpredictability add depth to the game—and beating him is a badge of honor for any Deltarune fan.
Whether you spare him for a stat-boosting armor or destroy him for a powerful weapon, Jevil represents a major milestone. So sharpen your skills, gear up, and step into the madness—because as Jevil says, “I can do anything!”