Shield

The Shield (シールド) is a default Defense Trigger used by all Border agents. It takes a Trigger slot. Border agents usually have two of them. Some combatants from Galopoula use it, too.

Appearance
Shield generates an even, transparent green barrier with no default shape or size. It is most commonly seen taking a hexagonal shape or a round, slightly convex one, but it can also take more complex forms, such as a crystal-like one. Furthermore, its shape can be modified even after it is summoned. The lower the surface area, the darker the color will be, mirroring its increase in density. When it is activated, a glowing green hexagon appears on the user's hand or arm.

Overview
It is unknown when Border created this Trigger. Since some Neighbour countries use it, it is possible Border copied their technology.

Abilities
As a fundamentally basic trigger, it is used by most trigger users. It creates a moderately strong shield that can be manipulated for size and power. Using the shields takes up a reasonable amount of trion, so the strength, durability, and size of the shields are normally dependent on how much trion the user is willing to put into it. Shields' resistance and durability are reversely proportional to the size: smaller shields have more strength and durability, but can be destroyed regardless of the size; even a small, focused shield can't resist an Ibis shot. As shown by Osamu Mikumo, these shields are rather disposable, as he uses it once to stop magnetic weapons without wasting his sword. Shūji Miwa also displayed the ability to divide a shield finely into numerous smaller versions in the same manner shooters do with their triggers to counter the animal bullets of Alektor. Additionally, as shield takes a slot in either the main or sub triggers, only one other trigger can be activated along with the shield.