A Radiant’s spren manifested as a weapon, summoned once they have sworn the Third Ideal. Wielding it lets the pair speak telepathically, though the spren cannot use abilities needing independent movement while in Blade form. It materializes the instant it is drawn rather than taking the ten heartbeats a dead-spren Blade needs, and glows with glyphs unless its Radiant wills it to look dead.

Summary

A Radiant’s spren manifested as a weapon, summoned once they have sworn the Third Ideal. Wielding it lets the pair speak telepathically, though the spren cannot use abilities needing independent movement while in Blade form. It materializes the instant it is drawn rather than taking the ten heartbeats a dead-spren Blade needs, and glows with glyphs unless its Radiant wills it to look dead.