The Ruby Knights is a guild that is located in Kanavan. Elesis is their appointed leader, but in her absence, her rival Gerald holds the place in her stead. There is nothing known about them, but is presumed that they are a well-known guild due to Lire's and Arme's reactions when Elesis reveals that she is the Ruby Knights' leader.
At the Gorge of Oath, Arme asks Elesis if she has any acquaintance with Ronan as both of them descend from Kanavan. However, she claims that the Ruby Knights and the Kanavan Royal Guard have no interaction with each other whatsoever.
Elscud, Elesis' father, was a former member and leader of the Ruby Knights until he went missing. When he became the leader, he started to gather the former members and made a name for Ruby Knights by fighting the vilest monsters and participating in the fiercest battles.
It is hinted that Sieghart used to be a leader of the Ruby Knights as well, and that it was after his disappearance when the Ruby Knights started to be corrupted.
Gerald Palenwhite is the son of Depas Palenwhite and Elesis's rival for the leadership of the Ruby Knights. After Elesis leaves to join the Grand Chase, Gerald acts as the de facto leader in her stead and supports her in her mission.
Arthur Larryschmidt is the son of the blacksmith of the Ruby Knights as well as Elesis's friend. For his friend who wanted to quickly become strong, he made Elesis's first sword, unbeknownst to her father Elscud. Because he wasn't able to protect her, he promised her to make a sword that would protect her in battle.
- In Elsword, another game designed by KoG Studios which has a very similar synopsis to Grand Chase, a group called the "Red Knights" exists with that game's Elesis as its captain.
- In the China and Taiwan servers, the Ruby Knights were known as the "Red Knights".
- Guild Master Bestair originally wanted to join the Ruby Knights in order to grow stronger so that he may better protect Rita. However, he was not accepted, suggesting that the Ruby Knights have high standards for their members.