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A second-grade artifact which is a white stone formed by the death of a human. White whistles are carved out of this material.

It is revealed by Bondrewd that White Whistles are made out of Life Reverberating Stones. Life Reverberating Stones are white stones created by the death of a human. If a person dies and possesses deep loyalty or love toward another person, they can potentially turn into a Life Reverberating Stone. Each Life Reverberating Stone possesses a life pattern unique to the person sacrificed for the stone; the pattern is only compatible with whomever the deceased perished for. Hence, the White Whistle can only be used by the individual it was intended for.

It is possible that some form of consciousness of the sacrificed person remains within the Life Reverberating Stone; when Riko, Nanachi, and Reg find Riko's stolen White Whistle being altered by a Narahate, Riko stops Reg from taking it back, sensing that Prushka 'did not hate it.'

Life Reverberating Stones have the strength to pull out the true purposes hidden within certain artifacts; it reacts into another relic, similar to the way the tone of White Whistles do.

Thus far, the only individuals known to have died for the creation of a Life Reverberating Stone are: Currently, it is unknown who died for the creations of the Life Reverberating Stones used to create the whistles of Ozen the Immovable, Lyza the Annihilator, Srajo the Obscure, and Wakuna.
 * Bondrewd, whose stone was used for his own White Whistle.
 * Prushka, whose stone was used for Riko's White Whistle.