ignite module
A device used in Senki Zesshou Symphogear GX.
Looks like three red crystals in a triangular arrangement resting upon the collar area. Also typically turns the underlying bodysuit black with a distinctive redesign. This tag can be used for said redesigns even if the Ignite Module itself is not visible due to the pose or angle.

Pixiv
Twitter
Bluesky
Weibo
Lofter
Tumblr