hello tumblr i really like deltarune and the chapter 3 secret boss so i made a guide for it!! i hope this is helpful for anyone who’s struggling with the fight.
Main Point: The main point of the fight is to just survive and spam Rude Buster as much as possible. You’ll want to prioritize TP gain.
Shadow Mantle: The Shadow Mantle is an item that reduces damage taken from the Knights attacks. You technically don’t need it, but I’d encourage it if you’re struggling with the fight.
Best Gear: This changes depending on if you’re doing a mercy or no mercy run. In a mercy run, put the Jevilstail and Shadow Mantle on Susie. On everyone else, you’ve got some options. The Spike Band is good for extra damage, the Dealmaker is good for defense, and TwinRibbon and LodeStone are good for more TP. I’d lean towards anything that gives more TP since Kris can only take 2-3 hits and Ralsei will likely get one shot. For weapons, go with whatever gives the highest damage. For Kris, use the Saber10, Susie should use the Toxic Axe, Ralsei should use the Flex Scarf.
In a no mercy run, you’ll have access to the Jevilsknife for Susie, which does a good bit more damage so you can use that. The Puppet Scarf is also good to have on Ralsei, since it’ll make him do more damage.
Items: For items, you’ll want to stock up on ReviveMints as they’re the only way to revive Susie and Ralsei once they’re downed. When they die, then get “Swooned” which drops them to -999 HP. Never use the ReviveMints on Kris, as you could just revive them with a regular healing item. Some other good items are the Deluxe Dinner, Spincake, and Exec Buffet. I also highly recommend having a TensionMax as that’s part of my strategy for the beginning of the fight. You can get most of these items from the B rank room gacha machine. You can also find a ReviveMint in the TV World by solving a puzzle.
Kris: Kris does very little damage during the fight, so I wouldn’t really attack with them unless you’re confident. I would mainly defend with Kris every turn and use items when needed. They do have the unique property of not getting swooned by the Knight, so don’t waste ReviveMints on them.
Susie: Susie is the MVP of this fight. Her Rude Buster attack does the most damage and you should prioritize doing it every turn if you can. Only have Susie use items when absolutely necessary. Also, right before her Rude Buster hits, press the A button. This will make it do a bit more damage, and this really adds up over the course of the fight.
Ralsei: Do NOT use Ralsei’s healing spell, it uses so much TP that you need to be saving for Rude Buster. Use Ralsei to defend, use items, and attack when you can. If he goes down, I wouldn’t worry about reviving him unless you feel it’s absolutely necessary.
Ok now let’s get to the actual fight.
First Two Turns: For the first two turns I have a specific strategy. On the first turn, have Kris use a TensionMax, Susie use Rude Buster, and Ralsei defend. Then, on the second turn, have Kris ACT and use Hold Breath. This makes your soul move faster. This is the ONLY ACT you use in the entire fight. Then have Susie Rude Buster and have Ralsei either attack or defend.
Ok now for each attack. The Knight has 5 main attacks that change a little bit each time.
I’m taking the descriptions for each attack from the Deltarune fan wiki.
* Crystal Barrage: The Knight sends out a spread of crystals that reverse direction a little before exploding into six shards, three of which will travel further and last longer than the others.
* The second time, shards will be slightly larger and all will travel the same distance.
* The third time, the crystals split into two shards in a random set of opposite directions. These then turn red and home in on the SOUL.
This attack is fairly easy. When the bullets start coming at you, just keep moving back, and hold B to slow down if you need more precise dodging. The bullets glow before they explode, so use that time to move to a spot that doesn’t have many bullets. Once they explode, just slowly maneuver around the shards, they aren’t very hard to dodge.
During the third time, when the shards start to home in on you, just move clockwise in a circle, the shards should fly right past you as long as you keep moving.
* Knife Dance: The Knight summons knives horizontally, vertically, and diagonally, each locked on the SOUL. After a small delay, each one instantly slashes across the Board in the direction it points.
* The second time, a ring of blades will surround the SOUL and move around the Board while the previous pattern occurs.
* The third time, the ring is gone, but the knives are summoned in much quicker succession.
This one is a bit hard to explain verbally, but I’ll try my best. My first piece of advice is do NOT move in a circle, you will get it. The best thing to do is move in the opposite direction the knife is moving. If the knife is coming at you horizontally, move either up or down without stopping. If it’s coming at you vertically, move either left or right without stopping. This attack takes some getting used you, but once you get it down it’s pretty easy.
I will say, the second version of this attack is the hardest attack in my opinion. Just try and focus on dodging the knives, as the circle doesn’t do as much damage.
* Board Rend: Repeatedly, the Knight slashes the Bullet Board in half either horizontally or vertically, pulls the halves apart, emits several bullets from the gap, and then pulls them back together. Do note the slash across the Board will still damage the soul.
* The second time, the Knight randomly switches between vertical and horizontal slashes.
* The third time, the Knight randomly switches between vertical, horizontal, and diagonal slashes, though the diagonal slashes seem to be less frequent.
For this attack, try and stay at the edge of the box, this gives you more time to react. I’d recommend not moving around too much, just pick one place and dodge and move back to that place. Before the box is split, there’s a red slash showing how it will be split. Use this to react and reposition. Try and stay on the same sides of the box, switching sides can confuse you. I always stay on the bottom or left.
The diagonal one is really tough, there isn’t as much of a clear strategy for it. Just try your best 😭
Blade Hallway: The Knight lengthens the Bullet Board before disappearing, and sends two rows of swords inward from the right of the screen with a narrow gap between. The gap will slowly shift up and down throughout the attack. After some time, the blades will all stop and turn toward the Soul, before telegraphing multiple slashes.
* The second time, the blades will slowly start to bend and twist in a nightmarish spinning corridor throughout the attack, turning counter clockwise.
* The third attack is identical to the first, just faster.
Now this attack was actually just nerfed to make the hitboxes smaller. For the first one, move to the back and just move slightly up or down. Defend before this attack if you need to. Once the hallway ends, quickly move to a safe spot before the knives fly at you.
For the second one, I’d start by moving forward and then moving back, try not to make dramatic movements, keep them concise.
* Sanguine Slash: The Knight centers a slash on top of the SOUL, before cutting across the whole Board. This attack repeats, with each two slashes adding extra cuts from 1, to 2, to 3, to 4. The slash with 4 cuts only happens once.
* The second time, the attack repeats with 3 slashes, and then four, omitting the single and double cuts for more of these.
* The third time, or when the Knight reaches a certain HP threshold, the attack repeats with 3 slashes, and then four, omitting the single and double cuts for more of these. Afterwards, a rotating single slash appears that the Knight slashes multiple times, This variation only seems to happen when the Knight has about 75% of their HP left. After this attack, they use Crystal Nova.
This is the easiest attack in my opinion, just keep moving. There’s not too much advice because it’s a pretty simple attack. If you’re feeling confident, try grazing the slashes as they give a lot of TP.
For the rotating slash, this is where using Hold Breath earlier comes in handy. You’ll be fast enough to dodge it easily if you just stay close behind it and follow the slash.
After the knight uses the rotating slash, there will be a turn where the Knight does not act. Make sure you’re healed up and ready for the final attack.
* FINAL ATTACK - Crystal Nova: The Knight moves into the center of the screen, and begins to pull crystal projectiles towards the screen, first in a random pattern, and then a swirling patters. and begins spewing crystal projectiles. These crystals then burst into shards, similar to Crystal Barrage, before the Knight then makes a diagonal cut through the center of the screen to finish the attack. This attack will only occur once the Knight's HP reaches 75%, and afterwards they can be attacked to end the fight.
This PK Starstorm attack is fairly simple. When the Knight starts drawing in the bullets, stay close to the Knight to give yourself more time to dodge. Eventually, the bullets will start spinning around the Knight. This is another reason I said to use Hold Breath at the beginning of the fight, because without the extra speed, this part is very hard to dodge. Just spin around the Knight, following the pattern of the bullets. Then, once that ends, run like hell away from the Knight before it shoots the bullets back out. Stay near the bottom of the screen to give yourself time to dodge.
After this attack, DO NOT HEAL. Just attack, you’ve won the fight.
And that’s it! It can be tough, but with practice it’s not too bad. Good luck!!
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