Knuck Brassels is horrified to see that the Maelstrom has overrun the Raven Bluff property. He enlists players' help in clearing the property, telling them to smash the Maelstrom Generator that is spawning the Stromlings and rebuild it into a platform to reach the Imagination Orb. Knuck suggests that players might need more skills and items to fight the powerful Maelstrom Horsemen and clear the property.
Once Raven Bluff is cleared of Maelstrom, Knuck Brassels allows players to rent Raven Bluff for a fee of 500 Coins per month. Knuck also unlocks the last set of new Behaviors for players to use on their properties. Knuck Brassels then leaves to help other Minifigures secure their properties.
In beta testing, Knuck Brassels was unnamed and simply identified as Property Guard. He used the same model as an alpha Sentinel Faction Guard, but with a standard silver Knights Helmet instead of the Sentinel Guards' gray high-tech visored helmets. Until the Crux Prime update, Knuck Brassels carried a unique spear design used by various Sentinel characters but never seen in an actual LEGO mold. In the Crux Prime update, this spear was replaced with one that combined the standard spear mold with a 1x1 cone brick.
Knuck Brassels's name is a spoonerism of the phrase "brass knuckles", a weapon used in hand-to-hand combat.