Grimslayer knights were those whose calling was to hunt down and protect villages from monstrous creatures during the Desolate Cascade. Now with the majority of monster populations dwindled beyond the large cities, most stay in the wilderness, hired by villages that are the most isolated by the protection of modern civilization.
Grimslayer knights are respected by most and are usually hired when a monster or group of monsters have been tormenting a local village or town. Most Slayer knights will not slay for coin, but instead for respect and favors among the populace.
A grimslayer knight can only be successful in battle against monsters if they have mastered themselves. Only then can they achieve mastery against monsters as well.
To a grimslayer knight, mastery of the self includes valor, strong faith in one's abilities, and a sharp mind even during the chaos of battle.
Between their sword and shield, the latter is more important because monsters always strike first, which is almost a guaranteed death. Those who follow this boast few scars.
Like most knighthoods, the aspect of honor is a trademark among the Grimslayer Knights. Knights are expected to live and die with their honor intact.
For the Grimlayer Knights, there is no honor to be gained in slaying monsters who are unable to fight back. There are some exemptions to this, such as mercy killing.
Some monsters slain by them in battle are posthumously honored via forging their remains into battle equipment, which are marks of distinction for the knight who earned it.