Slay the Dark One,

According to legend the center piece / artifact that can be found in the Imperial Vault is a weapon that has been used by Crea in a Precursor Universe to slay the Dark One.

While Crea was unsuccessful in eradicating the Dark One completley, she managed to split the dark entity into twelve elemetns, twelve pieces (aka the Twelve Tokens ).

Thew same legend also says that there was a 13th piece that had been collected and used to improve the weapon. If it would be used again it would this time kill and completley destroy the Dark One andgifting the wielder of the weapon with all the Dark Ones abilities and near omni potency. Granting the wielder god like powers.