White Whistle

About
White Whistles are second grade artifacts that can only be used by their original owner. They are made form Life Reverberating Stones and given further shape by the user's own modifications to the stone. White Whistles are able to activate dormant relics.

The White Whistle is a signature characteristic for the few divers that are allowed to dive past the fifth layer of The Abyss. Currently there are only a handful of recognized White Whistle users (although it's unknown if some of them are dead or alive).

White Whistles grant it's user powers, however the powers it grants varies per user. On top of this a White Whistle's powers are not made public until it's user has died. This is due to the fact that it wards off any potentially hostile countries out of fear of the unknown abilities that the White Whistle grants its user.

Life Reverberating Stone
Ok I can't stress this enough but seriously MAJOR SPOILERS up ahead. If you don't want to be spoiled then turn back now. Return is not humanly possible after you've passed this layer.

White Whistles are made out of Life Reverberating Stones, these are white stones created by the death of a human. In particular if a person dies and is very loyal and/or loving to another person they can potentially be turned into a Life Reverberating Stone.

The fact that Life Reverberating Stones are made from humans and that said humans are required to have loved/have been loyal to the future user of the Life Reverberating Stone, can be used to explain why White Whistles only work when used by their original owner. Maybe some form of consciousness is left within the Life Reverberating Stone from when they were still human.

Life Reverberating Stones can also be made by using one's own body as material for their own Life Reverberating Stone, though unless they're able to transfer their consciousness to another body this method kind of falls short due to the fact that the user is now the Stone itself. The only person to have successfully created a Life Reverberating Stone using this uncanny method is Bondrewd "The Novel", who used his original body as material for his Life Reverberating Stone when he received the title of White Whistle.

On the other hand, Life Reverberating Stones have the strength to pull out the true purposes within hidden artifacts, it reacts into another relic, similar concept of a White Whistle, e.g. Reg has a bunch of relics, when his navel got stabbed with Bondrewd, a reaction within his navel produces heat after the Life Reverberating Stone was formed.

White Whistle Owners
There are only a few people who own or have owned White Whistles:
 * "The Lord of Annihilation", Lyza the Annihilator
 * "The Immovable Sovereign", Ozen the Immovable
 * "The Lord of Dawn", Bondrewd the Novel
 * "The Lord of Mystery", Srajo the Obscure
 * Riko

Currently Riko is in possession of 2 White Whistles, her mother's (Lyza the Annihilator) White Whistle. And her own White Whistle which she obtained at the end of the Lord of Dawn Arc after Prushka dies and is subsequently turned into a White Whistle due to Riko being the first kid of the same age she meets and becomes friends with.