Thundering Roar: Muchōrin (雷轟・無兆鈴 Raigō: Muchōrin, 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's abilities are the incarnation of matter. Using this causes Platinum to lose memories – whether this means temporary loss or complete amnesia is uncertain. It's unknown what's the current status of Muchōrin – the latest, and probably the last thing it materialized was Hihiirokane.