Roktavor R2 Knuckle Unite, known as Rising Ragnaruk Knuckle Unite (ライジングラグナルク・ナックル・ユナイト, Raijingu Ragunaruku Nakkuru Yunaito) in Japan, is a Balance Type Beyblade that's a part of the Burst System as well as the Dual Layer System. As an anime-exclusive Beyblade, it was never released. It used to be owned by Boa Alcazaba before he obtained his current Bey, Balkesh B3 2Bump Atomic. Suoh Genji also used to own this Bey as well before he obtained Khalzar K3 2Glaive Orbit and then eventually his current Bey, Salamander S4 12 Operate. Other minor characters throughout the Burst series have been shown using this Bey too.
Energy Layer - Roktavor R2
Main article: Energy Layer - Roktavor R2
Roktavor R2 is a Stamina Type Energy Layer that features an elliptical shape akin to its predecessor Roktavor. Like its predecessor, the Layer's wings are molded into the visage of a head on either side, matching the anime's rendition of the Layer's beast; a winged demon. The placement of these wings is where the majority of the Layer's weight is, creating a high Outward Weight Distribution and Flywheel Effect which bolsters Roktavor R2's Stamina. While this may imply high Stamina potential, these wings also make up the primary points of contact, creating a recoil heavy design that severely diminishes the Stamina benefits of its Outward Weight Distribution and Flywheel Effect. While the high recoil of the elliptical shape and the wings may imply high Attack potential, the Takara Tomy release of Rising Ragnaruk features weak teeth that are unable to withstand the aforementioned recoil, meaning that this Layer is prone to losses by Burst.
Forge Disc - Knuckle
Main article: Forge Disc - Knuckle
Knuckle is a circular Forge Disc with six notches around the perimeter and four holes near the center of the Forge Disc. The letter "K" is written on its prongs for easy differentiation from other Forge Discs. Due to the holes in the Disc, Most of the weight of Knuckle is focused around its perimeter giving it high Outward Weight Distribution which results in excellent Stamina properties. However, it lags behind other Forge Discs like Spread and Gravity in terms of Stamina potential.
Although, one advantage Knuckle holds over the aforementioned Forge Discs is increased Burst resistance which only falls behind Down and Armed, both of which suffer from scraping issues and low Stamina respectively. Due to its good Stamina, decent weight and high Burst resistance, Knuckle was once an excellent Forge Disc for all kinds of Combinations. However, Knuckle has one major weakness, the protrusions nullify Life After Death potential which is detrimental in the current Life After Death centered metagame.
Performance Tip - Unite
Main article: Performance Tip - Unite
Unite features a flat rubber tip with a sharp plastic tip in the center, akin to the Coated Sharp Performance Tip of Metal Fight Beyblade, that sits at the standard height. When launched straight down into the stadium, the sharp tip in the center will keep the Beyblade stable and still in the center, preventing Stamina loss.
When a mint condition Unite is either knocked off balance by an opponent or launched at an angle, the rubber will make contact with the stadium, creating an aggressive movement pattern with speeds similar to Xtreme. However this aggressive movement is somewhat unreliable as the sharp center can slow it down in the center of the stadium or stop the movement entirely.
When worn however, instead of creating aggressive movement when struck, the rubber will instead act as brakes against a KO, at the cost of Stamina, before going back to the center of the Stadium due to the sharp tip.