Spider

"The good thing about this Trigger is that it doesn't use much trion. You can adjust the color of the wire so it'll be harder to spot. You work with the Operator for visual support, and make it so only your allies will see the wires clearly."

- Ai Kitora about Spider

Spider (スパイダー) is an Optional Trigger. Ai Kitora's customized version, however, is classified as a Gunner Trigger.

Appearance
When activated, Spider takes the form of a small trion cube with two arrow-shaped hooks in the middle of opposite edges. "Firing" the cube causes it to vanish and shoot the hooks in the direction they were facing, connecting them with a moderately thick wire. The wire is gray, but its color can be modified at will. Kitora's Spider is integrated in her gun, which has an opening under the main barrel to shoot Spider from.

Overview
The origins of this Trigger are unknown, but it is known to exist since before Mirai Hatohara defected.

Abilities
The Spider creates wires that can be used to trip opponents or prevent motion. The color of the wire can be adjusted, making it harder for opponents to spot them. With an Operator, it can be set such that only the user's team could see it. It can also be set up with Meteora in a tripwire fashion. Even if it is noticed by the intended target, their distraction by Spider could be diverted to the trap allowing for an effective sneak attack by a skilled fighter.

Users
See also: Spider Users

Spider was noted to be an unpopular Trigger due to not directly leading to the scoring of points. As a matter of fact, it has only 4 users: Reiji Kizaki, Takaaki Katagiri, Osamu Mikumo and Ai Kitora, the latter of whom utilizes a customized version. Mirai Hatohara is a former user.