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Kerbeus K2 Knuckle Unite, known as Kaiser Kerbeus Knuckle Unite (カイザーケルベウス・ナックル・ユナイト, Kaizā Kerubeusu 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's owned by Nika Aoi but other minor characters have also been seen using this Bey.
Energy Layer - Kerbeus K2
Main article: Energy Layer - Kerbeus K2
Kerbeus K2, like its predecessor Kerbeus, is a round and thin Energy Layer designed for Defense. As such, its design consists of a six-bladed top-layer made of clear plastic; that each have a large gap in between, and a round bottom-layer made of colored plastic that's molded into the shape of chains; with each "link" of the chain-like layer slightly protruding outwards. In the center of the Layer are three dogs heads with flames near each head, representing the Layer's original namesake; Kerberos, the three-headed guard dog of the Underworld featured in Greek mythology.
At first glance, the design of Kerbeus K2, while round, appears to imply high recoil. However in reality, due to how thin the Layer is, both the clear and colored plastic layers come into contact with the opponent's Layer at the same time and cover each other's gaps in the process, and as such, is capable of reducing recoil and potential subsequent Stamina loss. For the Takara Tomy release of Kaiser Kerbeus, its strong teeth made it excel in Defense Combinations when in certain conditions. However, while this may imply high Defense potential, there are two major weaknesses:
First, when the Kerbeus K2 Combination is knocked off balance, only the six-bladed top-layer will come into contact with the opponent. As such, due to the aforementioned large gaps in between each blade, this increases the risk of the Kerbeus K2 Combination Bursting. As such, it is critical to pair up Kerbeus K2 will a Performance Tip with great stability.
Finally, the weight distribution of the Layer ends up creating poor Stamina, making Kerbeus K2 Combinations liable to being Out Spun.
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.