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Rouxls after the party completes his first puzzle

Rouxls Kaard (pronounced "rules") is a Darkner NPC and supporting antagonist in Chapter 1 of Deltarune. He introduces himself as the Duke of Puzzles, and attempts to thwart the party by forcing them to solve his puzzles. After being defeated multiple times, he claims to have helped them and refers to his prior actions as "Tests of [their] Heroick Resolve."

Rouxls has a shop on the fifth floor of Card Castle, containing mostly equipment along with one healing item. It's the second shop in the game, the first being owned by Seam. His wares include:

After King is overthrown, Rouxls is among the characters that can be said goodbye to, implying that he works for Lancer.



Rouxls Kaard is an adult-sized humanoid. His head is diamond-shaped, with long white hair folded on the back of his head, and a (seemingly) melted face composed of two diamond-shaped eyes and a large mouth. As a garment, he wears a royal suit with epaulets. In terms of color-scheme, Rouxls is entirely in a flashy deep blue except when in his shop, where he appears to be black.


Rouxls acts very egotistically during the events of Deltarune chapter 1. He claims to be the Duke of Puzzles, and attempts to stop the party by forcing them to solve his puzzles. However, he is an incompetent puzzle-maker; each of his puzzles consist of the bare minimum of elements -- a box and a button -- and he makes no attempt to obfuscate the solution in any way. He also vandalizes clues on puzzles he did not create, in order to make them "harder".

He uses Early Modern English speech patterns, presumably to appear educated, but this amounts to little more than replacing all instances of "you" with "thou", randomly adding "-est" and "-eth" suffixes, and haphazard capitalization of phrases for emphasis. When his pride is hurt, he doubles down by intensifying his misuse of Early Modern English to the point of incomprehensibility; but when surprised or stressed, he tends to drop it altogether.

Rouxls is also the shopkeeper on the fifth floor; initially, he says that he's merely selling the heroes items in order to raise money to defeat them. After all his puzzles are solved and his K. Round is defeated, however, he proclaims he's now their ally as he's "always on the winning side," indicating a lack of loyalty in his character.

Lancer considers Rouxls to be his "lesser dad". Rouxls is alternately irritated with and endeared by Lancer and his antics.

Main Story


Some time after King and the Knight got into power by locking away the other 3 kings, King fired all puzzle makers. King then appoints Rouxls Kaard as the new and only Duke of Puzzles to replace the old puzzle makers. Some time before Kris and Susie enter the Dark World, Rouxls vandalises already existing puzzles in Field and Forest to make them more difficult. In doing so, he purposefully breaks "the rules" of the puzzles, only to comment that "[he] makes [his] own Rules."

Chapter 1

After the party reaches Card Castle's second floor, Rouxls traps them in a room with a puzzle, preventing them from leaving before the puzzle is solved. The party manages to solve his puzzle with a one-step solution, and he disappears, allowing the party to continue. However, he appears again on the fourth floor, under similar circumstances. He forces the party to solve his "ultimate puzzle", and they do so successfully. Rouxls claims that "wasn'tst REALLY [his] ultimate puzzle," and when asked to show it, he quickly disappears instead.

Eventually, the party reaches the fifth floor, where Rouxls's shop can be found. He claims to have set the shop up to garner funds for his schemes to defeat the party. After the party continues on towards King, Rouxls interrupts them, and enhances a C. Round with a Control Crown; turning it into a King Round, which he then has the party fight. After the K. Round is defeated, Rouxls's alliance immediately shifts, as he tries to explain to the party that he was simply testing their abilities all along. After claiming that he no longer poses as an obstruction to the party, he goes away.

After King is overthrown, Rouxls can be found on Card Castle's roof, congratulating the party. He is positive that "History shall not forget - The tale of Rouxls Kaard, and the Three Heroes!"

Chapter 2

When the party decides to leave Castle Town, Rouxls will accompany them in Kris' pocket, alongside Lancer. He appears in the KEY tab of their inventory, although he can't be interacted with. When leaving Castle Town, Rouxls disappears from Kris' inventory

Eventually, during Kris and Ralsei's ride through Queen's battery acid pool, Rouxls appears again, riding the Thrash Machine the party designed during Chapter 1, and combat ensues. During the fight, he apparently uses different attacks based on the parts the machine is composed of (testing needed). When defeated, all of Rouxls' body except his head turns to stone, much like Lancer does earlier, as he falls off the Thrash Machine with a "GOD. DAMMIT."

Right before the final showdown with Queen, Rouxls helps build the Thrash Machine the party uses to fight her in her own mech, using the head of the machine he uses during his encounter, which unlocks different ACTs for the battle


Upon Entrance

  • Welcome to my shop, you ungrateful worms.
  • Welcome, welcome, my Heroick Comrades! [After K. Round]

In shop

  • Anything else?


  • See thou in the Dungeon, Worms!
  • Come by any time, my good Worms! [After K.Round]


  • What shalt thou buy? [While purchasing]
  • Thanks, worm. [After purchase]
  • Thanks, hero! [After purchase, after K.Round]
  • Your funds are lacking. [Not enough D$ for purchase]
  • Thou doth carry too much! [Full inventory]
  • Perhaps another ware? [Refuse to buy]


  • Showeth me your treasure! [While selling]
  • What ITEM shalt thou proffer? [While selling an item]
  • What ARMOR shalt thou proffer? [While selling armor]
  • What WEAPON shalt thou proffer? [While selling a weapon]
  • I shall make use of this! [On sell]
  • What? [Refuse sell, sell empty slot, Jevilstail, Devilsknife]
  • Er, NO thank you. [Sell Manual]
  • You have none! [Attempt to sell without items]
  • That seems to be all, no? [Sold all items]


  • Ah, what is thine Intereste?

About Yourself

  • I amst the Duke of Puzzles, Rouxls Kaard.
  • My hobbies includest calligraphy, lawkeeping, bugkeeping, cages...
  • and long walks in the dungeon.
  • Artest thou one of my admirers, worm?
  • By the way, no hard feelingst about earlier, right? [After K. Round]

Why sell to us

  • Hahaha! So I might amasseth funds, Worms! An army of funds...
  • So that I may crushest thou like Fermented Grapes, into a most delicious and adult beverage-
  • Vengeance! Ahahaha!!!
  • Oh, how I amuse myself!!!

Why sell to us [After K.Round]

  • Haha, why of course I wouldst sell to my compatriarts, the Heroes of Legend!
  • Earlier art but a Test of your Heroick Resolve!
  • Rouxls is ALWAYS on the winning side! Thou can bet on that!!!

The King

  • Our Lorde King art a cruel and terrifying Monarcke!
  • However, he is also Brilliant, for he decidedesteth to appoinst ME, as Duke of Puzzles.
  • After pretty mucheth everyone else was firedst or placed inside a cage.
  • Truly, a benevolent ruler!

The King [After K. Round]

  • Yes, the King! A terrible Man! An awful Monarcke!
  • Never likedeth that Guye, really!
  • I just envisionethed, perhaps...If I acceptedst this High Ranking Positione...
  • I could assist to overthroweth him from the Inside!
  • ...What!? Cannot thou conceiveth of my plan?!?

The King’s Son

  • His Son, on the other hand, is more troublesome than a fistful of fleas!
  • He alwayst asks me the Worste Queries,
  • And calleth me his "Lesser Dad."
  • Our relation is NONE, you little water-beetle! I placate you for your Father's sake!
  • I do not Wisheth to hear your MP3's! I would rather listen to the sweet song of Death!
  • ...
  • How is he, anyhow?

The King’s Son [After K.Round]

  • Perhaps my wording art a bit Harshe earlier...The King's offspring is a Darling!
  • A strange and irritating darling!
  • When his father does not cook, his Son yells like a baby bird, until I feed him worms!
  • Is this what it means to be High Ranking!?


  • Rouxls's name and motif are plays on "rules card," the (card shaped) instruction manual that often comes with playing card decks. This card has no purpose in playing card games and is often discarded from decks.
    • This is supported by the fact that a sign he made early in the game says "PS - I make my own Rules."
  • Rouxls's line "Lost...? Frightened...? Confused...? GOOD!! HA HA HA!!!" is likely a reference to a line from the educational game I. M. Meen.
  • Rouxls was originally going to have his own battle theme, but it was scrapped because Toby realized he is "not very epic at all" and felt like you would be able to defeat him in one hit.[1]
  • Toby remarked that he thought "everybody was going to hate that guy" when he made Rouxls. [2]

  1. UNDERTALE 6th Anniversary So We Play DELTARUNE Chapter 1 For Some Reason - LIVE! - YouTube
  2. UNDERTALE 6th Anniversary So We Play DELTARUNE Chapter 1 For Some Reason - LIVE! - YouTube