Vasilissa takes the form of a backpack-like device with four mechanical arms extended from it. Each arm has three joints and ends in a curved blade. The device has pins inserted into it.
Each arm has great power, enough to pierce, lift and throw a large amount of rubble and to pin Tachikawa to a wall. They can also be moved quickly and have a relatively long reach. The arms are also very durable, withstanding the assaults of Border's normal Triggers, with the exception of Kirie's Axe, a special Trigger. Gatlin was very surprised by it, as he thought only a Black Trigger could damage Vasilissa. Should a blade be cut off, it can be replaced by a flat shield.
- Vasilissa (Βασίλισσα, Vasílissa) is the Greek word for "queen".