During each of your End Phases, destroy this card unless you send 1 "Iron Core of Koa'ki Meiru" from your hand to the Graveyard or reveal 1 Beast-Warrior-Type monster in your hand. Once per turn, you can reveal 1 "Iron Core of Koa'ki Meiru" in your hand to Special Summon 1 Level 4 or lower "Koa'ki Meiru" monster from your Deck, except "Koa'ki Meiru Urnight".
Koa'ki Meiru Sea Panther allows you to send 1 "Iron Core of Koa'ki Meiru" from your hand to the Graveyard to return 1 Spell Card from your Graveyard to the top of your Deck. Koa'ki Meiru Prototype protects 1 face-up "Koa'ki Meiru" monster on the field from being destroyed during the End Phase. When a face-up "Koa'ki Meiru" monster(s) on the field is destroyed during the End Phase, you can Special Summon 1 "Koa'ki Meiru Token" (Rock-Type/EARTH/Level 4/ATK 1800/DEF 1800).
If Koa'ki Meiru Powerhand battles with a LIGHT or DARK monster, any of that monster's effects that activate or apply on the field are negated during the Battle Phase, while this card remains on the field.
Koa'ki Meiru Maximus allows you to select and destroy 1 card your opponent controls, but this monster cannot be Normal Summoned/Set, and you are required to banish 1 Iron Core of Koa'ki Meiru from your Graveyard to Special Summon it.
Koa'ki Meiru Ice allows you to send 1 card from your hand to the Graveyard to destroy 1 Special Summoned monster on the field. Koa'ki Meiru Crusader. If Koa'ki Meiru Crusader destroys an opponent's monster by battle, you can add 1 "Koa'ki Meiru" card from your Graveyard to your hand.
Iron Core of Koa'ki Meiru can be sent to the Graveyard as a cost to maintain Koa’ki Meiru monsters on the Field. You can recover this card back to your hand by skipping your Draw, or sending 1 Koa’ki Meiru monster from your Hand to the Graveyard, during your Draw Phase.
Iron Core Immediate Disposal allows you to send Iron Core of Koa'ki Meiru from your Deck to the Graveyard directly. Urgent Synthesis allows you to return Iron Core of Koa'ki Meiru from your Graveyard to your Deck to Special Summon 1 level 4 or lower “Koa'ki Meiru” monster from your Hand or Graveyard, to your Field. Koa'ki Meiru Shield can be used to destroy all attack position monsters your opponent controls, provided you have 2 or more Iron Core of Koa'ki Meiru in your Graveyard.