Thundering Roar: Muchōrin (雷轟・無兆鈴 Raigō: Muchōrin, Thundering Roar: Unsigned Bell, localized as Arma Reboare: Muchōrin) is an Arch-Enemy Event Weapon with a form similar to a big wand. It is, or was, wielded by Platinum the Trinity; its previous wielder was Trinity Glassfille.
Muchōrin is able to materialize substances. Using this causes Platinum to lose memories – whether this means temporary loss or complete amnesia is uncertain. There is a possibility this is caused by Trinity, who used to took control over Platinum, and they refer to it as memory loss because they have no memories of the time Trinity used their body.
When Platinum wields Muchōrin it has a different appearance to when Trinity wields it.
It is unknown what happened with Muchōrin after it was used to materialize Hihiirokane.