Penetrate

"Penetrate" (貫通 Kantsū) is an aggressive Keyword that lets you deal damage when it attack and destroy the opponent's monsters in the center.

It is marked by the text: 

Ancient World

 * Duel Sieger "Tempest Enforcer"
 * Gold Dragon, Abend

Danger World

 * Armorknight Ifrit
 * Armorknight Medusa
 * Hysteric Spear
 * Strong Horn Dragon, Diatlus
 * Twinblade Dragon, Double Zase
 * Violent Dragon, Magnagran

Darkness Dragon World

 * Lamenting Black Steel, Balomdahl

Dragon World

 * Awl Pike Dragon
 * Dirge Drill Dragon
 * Dragon Knight, Spartax
 * Drum Bunker Dragon, "Barrier Breaker"
 * Drum Bunker Dragon, "Dual Wield"
 * Drum Bunker Dragon, "Spinning Lance"
 * Jackknife "10000"
 * Pile Bunker Dragon
 * Super Armordragon, Aura Sword Dragon
 * Super Armordragon, Drum Breaker Dragon
 * Super Armordragon, Masterkravis
 * Thunder Knights, Drum Bunker Dragon
 * Tuck Sword Dragon
 * Warhammer Dragon

Dungeon World

 * Guardian Dragon of the Ruins, Meteor Rain
 * One-eyed Demon Lord, Keith Wanaid

Katana World

 * Blood Knife, Kimensai
 * Elite Sword, Mikazuki Munechika
 * Sky Rush, Garyu-oh

Legend World

 * Armored Dragon, Cuelebre
 * Colossal Sea Monster, Cetus

Magic World

 * Demon Programmer, Marbas

Danger World

 * Armorknight Griffin "A"
 * Drill Bunker!!

Dragon World

 * Dragonic Dash
 * Explosion Heat Cavalry Dragon, Revol Burst
 * Jackknife "Dispersal"

Dungeon World

 * Brave, Drum
 * Fledgling Warrior, Ocker Glaser
 * Legendary Brave, Tasuku

Legend World

 * Knights of the Round Table, Gawain
 * Knights of the Round Table, King Arthur

Darkness Dragon World

 * Black Knight, Goldred

Dragon World

 * Super Armordragon, Vajra Blaster Dragon

Dungeon World

 * Legendary Warrior, Gao

Katana World

 * Perfect Beauty, Hyoshi Shirasagi

Rulings

 * If a monster in the center area is destroyed by an opponent's monster that has Penetrate, then even if the player uses an ability to prevent that monster from leaving the field (such as Soulguard), Penetrate damage will still be dealt.
 * This ability is also possible with a Link Attack. Should the monster in the opponent's center area be destroyed by a Link Attack, damage will be dealt to the opponent fighter from the card with the 'Penetrate' ability only. If 2 or more cards in the Link Attack have Penetrate, each critical from all the cards with Penetrate will be dealt as damage seperately.
 * If the attack target of a monster with Penetrate leaves the field before it is destroyed, Penetrate damage is not dealt.
 * If a monster with Penetrate is given the Counterattack ability, and due to this Counterattack ability, it destroys an opponent's monster in the center, the opponent will not take any damage from the Penetrate ability. Penetrate requires an opponent's center monster to be attacked and destroyed for it to activate. However, Counterattack simply destroys a monster as an effect, and is not actually considered to be 'an attack.'
 * Damage dealt by penetrate is treated as ability damage not damage dealt by an attack.