Koa'ki Meiru War Arms

Koa'ki Meiru War Arms was released in 2009 as part of the Raging Battle expansion set, a pivotal release in the Yu-Gi-Oh! Trading Card Game that introduced the Koa'ki Meiru archetype. These monsters were designed around a unique mechanical theme of maintenance costs, requiring players to either reveal a specific card type from their hand or send an Iron Core of Koa'ki Meiru to the graveyard during each end phase to keep the monsters on the field.

The design of the Koa'ki Meiru line emphasizes a heavy, industrial aesthetic, blending organic creatures with mechanical, armored attachments. As a Super Rare card in the RGBT set, War Arms was intended to provide offensive pressure for the archetype by equipping itself to a Koa'ki Meiru monster to boost its attack power. The archetype was well-received by competitive players for its high-risk, high-reward resource management style, though it faced challenges keeping pace with the rapidly accelerating meta of the era.