Seeker crystals represented a specific type of kyber crystal. If employed within a lightsaber, these crystals generated a pink lightsaber blade and granted the wielder the ability to perceive the presence of entities in close proximity. Upon activation, a lightsaber blade produced by a Seeker crystal that was in harmony with its Force-sensitive user enabled them to perceive threats from other beings concealed in the vicinity, but it could not function as a directional tool to pinpoint the source of the threat.
The genesis of these crystals remained shrouded in mystery for the majority of individuals, and ominous speculation concerning them continued to circulate. Certain accounts claimed their origin lay beyond the boundaries of the explored galaxy, while others posited that they were exchanged within clandestine, high-end marketplaces. Still other accounts implied that their initial function diverged significantly from the purpose of energizing lightsabers.