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{{Infobox/Yu-Gi-Oh!/Archetype/End}}
'''Koa'ki Meiru''', sometimes romanized as '''Core Chimail''' (a combination of the words "Core", "Chimera", and "Mail", a synonym for armour) are is a series of monsters theme from [[Raging Battle]], [[Ancient Prophecy]], [[Stardust Overdrive]], [[Absolute Powerforce]], and [[The Shining Darkness]]. However the support card "[[Koa'ki Ring]]" and other anti-meta cards appear in [[Starstrike Blast]].
Koa'ki Meirus are all [[EARTH]], [[WIND]], [[WATER]] or [[FIRE]] attributes, rendering them immune to their own control based effects which often affects all affect [[LIGHT]] and [[DARK]] monsters. All of the "Koa'ki Meiru" have the same mark (3 dragons) on some part of their body or on a weapon they have. Also, many Koa'ki Meiru and related cards' artwork uses yellow, orange, and red, except [[Koa'ki Meiru Ghoulungulate]].
==Playing Style==
The main strategy theme was initially designed to bring down the dominating decks of over 2 banlists therefore centering around heavy control elements. Seeing as the "Koameta was ''ki Meiru" is [[Anti-Meta]] - A Deck build which oppose the popular Decks that are played. For example, "[[Koacompletely'ki Meiru Drago]]'s" effect was designed especially to oppose [[Lightsworns|Lightsworn]]dominated by LIGHT and DARK decks, [[Dark Armed Return]]effects specifically targeted both Attributes therefore bringing about a specific Meta, and [[Blackwings|Blackwing]] Decks for Anti Meta theme. Because of their high [[SwarmATK]]ing capabilities. Against meta decks, Koa'ki Meirus tend to have powerful 11 lvl 4 monsters from 1900 ATK, topping out at 2100 ([[Lockdown]] capabilities. In addition, several low-level Koa'ki Meiru monsters have [[ATKPowerhand]]s that are considered extraordinarily high for a monster of it's level (there are 8 monsters with 1900 ATK and 3 monsters with 2000 or more ATK, all at level 4), as well as having a beneficial effect (if not counting and the nature of the revealing part)new support, thus they can play semi-the theme has taken a more aggressive approach with powerful beatdown as well. elements, namely [[Koa'ki Meiru Speeder|Speeder]] has 2200 [[DEFRooklord]] and [[Koa'ki Ki Meiru Hydro Barrier|Hydro Barrier]] has 1900 [[DEF]], also very high, considering they're both [[LevelUrnight]] three.
Generally speaking, there are two possible ways to use Koa'ki Meiru cards. The most obvious is to simply use a dedicated deck dedicated to the entire archetype; the other is being to use individual Koa'ki Meiru monsters as a supplement in another deck to Type specific decks of their type, giving an [[Anti-Meta]], controlling aspect to it as well asbeing able to maintain it through the alternative maintenance cost; for example, in a Dragon-based deck, use a using [[Koa'ki Meiru monster that has revealing Drago]] in a Dragon-type monster deck as seen in your hand as its maintenance costDisaster Dragon builds.
You can also play a RFG Koa'ki Meiru deck. Ghoulungulate can protect your monsters while setting you up for [[Return from the Different Dimension]]. Milling elements are recommended to load your grave. The set up takes time so you can use Royal Oppression as you aren't in any rush. Cyber Valley is also a great asset to the deck.
==Weaknesses==
Because [[Iron Core of Koa'ki Meiru]] may often be in the graveyard, it is vulnerable to cards that can remove it from play, such as [[Gladiator Beast Retiari]], and [[Macro Cosmos]]. Also, having multiple Koa'ki Meiru monsters on the field at once can be extremely dangerous, as each one would require you to reveal or discard a card from your hand at the End Phase; leaving hand and field advantage very hard to maintain, unless multiple copies are used (for example, 3 Koa'ki Meiru Powerhands only require 1 Normal Trap Card revealed). Koa'ki Meirus are very reliant on the hand and so cards like [[Card Destruction]], [[Mind Crush]] or [[D.D. Designator]] can completely disrupt the player's strategy, and cards like [[Trap Dustshoot]] or even [[Des Koala]] deal serious damage.
Amazingly, one way to beat the Koa'ki Meirus can also be used as splashable tech, such as Drago Meiru format is to have the opponent permanently reveal their hand to you on their turns in a Dragon Deck and Doom in a Fiend Deck (although their effects may end up working against order to make them either discard an Iron Core of Koa'ki Meiru or destroy the controller if other monsters they control are LIGHT or DARK attribute)card, since it's very difficult they cannot "reveal" the card to work around with multiple you. Such cards include [[Respect Play]] and [[Ceremonial Bell]]. [[Remove from play]] Decks can remove "[[Iron Core of Koa'kiski Meiru]]" and so you have to rely on your revealing effect. It is best a good idea to have [[Necrovalley]] and a [[Burial from a Different Dimension]] in your [[Side Deck]].
==Playing Tips==
This deck revolves around [[Anti-Meta]]. Obviously, the most important card needed in the deck is "[[Iron Core of Koa'ki Meiru]]", so having three in your deck is a must. Most of the monsters are used against [[Effect Monsters]], mostly [[DARK]] and [[LIGHT]] monsters, since they are the commonly used decks ([[Infernities]], [[Lightsworns]], [[Blackwings]] etc...). It is best to also have three of "[[Koa'ki Meiru Boulder]]" and "[[Koa'ki Meiru Crusader]]" in your Deck. "[[Koa'ki Meiru Boulder]]" can search for "[[Iron Core of Koa'ki Meiru]]" or a needed Koa'ki Meiru monster. "[[Koa'ki Meiru Crusader]]" can add "[[Iron Core of Koa'ki Meiru]]" from your [[Graveyard]], so you do not have to add it to your hand during the [[Draw Phase]]. "[[Koa'ki Meiru Speeder]]" has a high Defense and if you draw "[[Iron Core of Koa'ki Meiru]]" you can draw another card. While usually this proves itself quite situational, you can abuse the effects of "[[Koa'ki Meiru Hydro Barrier]]" and "[[Koa'ki Meiru Tornado]]".
[[Trade-In]] can work well if using [[Beast King Barbaros]] to reveal for [[Koa'ki Meiru Urnight]] and [[Koa'ki Meiru Crusader]]. Other level 8 monsters to work with [[Trade-In]] are [[Koa'ki Meiru Valafar]], and [[Koa'ki Meiru Maximus]]. Maximus can also reveal for [[Koa'ki Meiru Drago]] and Valafar is a strong beatstick that is immune to [[Torrential Tribute]], [[Bottomless Trap Hole]], [[Mirror Force]], [[Call of the Haunted]], and [[Core Reinforcement]].