Under (アンダー, Andā) is a Disc Frame released by Takara Tomy and Hasbro as part of the Burst System as well as the God Layer System and SwitchStrike System. It debuted in Japan with the release of the B-101 Random Booster Vol. 9 Beat Kukulcan.7U.Hn on December 28th, 2017. It later debuted in western countries with the release of the SwitchStrike Starter Pack Khalzar K3 7Under Hunter.
Under features a diamond shape with clockwise protrusions on each corner, akin to Force or Cross, at a downward angle. This shape is meant to increase Burst Attack during Disc-to-Layer contact in Right-Spin Combinations. However, due to most Burst Performance Tips being of the same or very similar heights, such contact is rare and the direction of the protrusions reduces recoil when used on Left-Spin Combinations. While the round shape of the Frame may imply high Life-After-Death, the downward angle of the protrusions creates a perimeter too rough to aid in Life-After-Death in Defense and Stamina Combinations like Cross and Glaive. However, Under is one of the heavier Frames in the metagame, which grants high Attack potential when paired with Core Discs such as 0 or 7.
Under's ability to further add weight to Core Discs makes it a key part in many Attack Combinations.
However, due to being lighter than Meteor or Bump, Under is not a must have but is instead a welcome addition to a blader's collection.
- B-101 Random Booster Vol. 9 Beat Kukulcan.7U.Hn - 01: Beat Kukulcan 7Under Hunter
- B-101 Random Booster Vol. 9 Beat Kukulcan.7U.Hn - 08: Gigant Gaia 8Under Quake
- B-111 Random Booster Vol. 10 Crash Ragnaruk.11R.Wd - 08: Legend Spriggan 0Under Nothing
- B-00 Under (Gold Ver.)