The classic Mega Blast monster for the Dark Irregulars gets repurposed into something much more useful.
V-BT02/019 RR デーモンイーター Demon Eater
Grade 3 / Normal Unit – Protect / Dark Zone – Dark Irregulars – Elf
AUTO (VC): When your Guardian is retired, place that card into the Soul.
AUTO (VC/RC): When it attacks, COST [Counter Blast 1 & Place another of your Rear-guards into the Soul], Draw 1 card, during that battle this card gains Power+10000, and if you COST [Soul Blast 10], your opponent cannot call Sentinels from the hand.