Terradragon Regarion Doom

Terradragon Regarion Doom is Serenity Creature Partner that protects her from harm in coming for her but as the good side of that Regarion Doom is very playful to Duelist

But somehow until Invaders try to conquest Kaijudo City, Regarion summoned by Serenity to duel against Zeref and Vile Ichor but so later He was very good protector for her during duels not to Fingers though