Beryllium Coil is the Legion Master of Helix. With his excellent strategic capabilities, he has led the small legion to great success.
Beryllium Coil led a team against Prominence territory Nerima 2 in a Territory Battle, copying Sky Raker's ICBM strategy with Chili Powder. Unfortunately, Nerima 2 was guarded by Blood Leopard, who had ample experience fighting against the strategy.
Beryllium Coil is a Duel Avatar made of the metal beryllium and is a bluish metallic gray. He has a triangular visor, and powerful springs in his forearms and calves.
- Jackknife – Two large spring-loaded jackknives, one on each arm, that can almost double his range.
- Spring Dash – Beryllium Coil's level 5 level-up bonus, which granted him springs in his calves. This ability allows him to dash by releasing the springs.
- Judgement Blow – An ability given to all Legion Masters that allows them to instantly uninstall Brain Burst from one of their legion members.
- Accel World Volume 18 side story: Prominence Trajectory Chapter 3