Strikethrough

While wielding a Two-Handed Weapon, or while wielding a Bastard Sword or Dwarven Axe in your main hand and a Shield, Orb, Rune Arm, or nothing in your offhand, your attacks can Strikethrough. When your attacks can Strikethrough, every attack has a chance ("Strikethrough Chance") to hit an additional target. By default, players have a 20% Strikethrough Chance (which can be improved through feats and enhancements). If your Strikethrough Chance is over 100%, you are guaranteed to hit a second target (if in range) on your attacks, with a chance to hit a third. The cap to Strikethrough is 400% (or 5 targets).

Strikethrough was introduced in Update 45 and replaced Glancing blows.

Strikethrough Chance

• Base: 20%

Feats

• Two Handed Fighting: +60% chance
• Improved Two Handed Fighting: +30% chance
• Greater Two Handed Fighting: +30% chance
• Perfect Two Handed Fighting: +30% chance
• Natural Fighting: +60/30/30% chance
• Greater Domain of Destruction: +5% chance

Enhancements

• Angry Arms: +5/10/20% chance
• Mad Munitions: +5/10/20% chance
• Focus Wide: +50% chance
• Improved Second Strikes: +5/10/20% chance
• Followthrough: +50% chance
• Improved Second Strikes: +5/10/20% chance
• Hand and a Half Training: +5/5/5/5% chance
• Dance of Death: +50/100/200% chance
• Dwarven Axe Training: +5/5/5/10% chance
• Great Weapon Aptitude: +5/10/20% chance

Epic abilities

• Malicious Weapons: +5/10/20% chance
• Wild Weapons: +5/10/20% chance
• Unbridled Fury: When activated, +100% chance

Filigrees

• One Against Many (3 pieces): +5% chance

Special attacks that strike through

Some special attacks are able to hit the secondary target(s). Based on DDO Forums.

Artificer

Battle Engineer enhancements

• Caustic Strike
• Shatter Defence
• Thunder-Shock Weapon

Renegade Mastermaker enhancements

• Mighty Slam
• Battlefist

Barbarian

Frenzied Berserker enhancements

• Cracking Attack
• Exhausting Blow

Occult Slayer enhancements

• Ear Smash
• Vicious strike

Ravager enhancements

• Cruel Cut
• Hate
• Slaughter

Bard

Swashbuckler enhancements

• Blow by Blow
• Coupe de Grace

Warchanter enhancements

• Frozen Fury

Cleric

Warpriest enhancements

• Smite Foe

Druid

• Nature's defensive stance allows strikethrough. While in bear form, strikethrough works regardless of what weapons you wield.
• Animal form spell Shred. Other bear form Innate Attack (school) spells (e.g. Maul (spell)) suspected but not confirmed.

Favored Soul

War Soul enhancements

• Smite Foe

Fighter

• Kensai enhancement - Shattering Strike

Monk

• Finishing moves
• Fire/air/water/earth strikes
• Fists of Darkness
• Fists of Light

Henshin Mystic enhancements

• Elemental words (all-consuming flame, porous soul, static charge, winters touch)

Ninja Spy enhancements

• Ninjutsu line (modify touch of despair finishers)

Shintao enhancements

• Jade Strike
• Tomb of Jade
• Dismissing strike
• Smite tainted^{[Unverified"Smite tainted" has not been verified in-game. Please verify it!]}

Paladin

• Smite Evil

Rogue

Assassin enhancements

• Shiv

Thief-Acrobat enhancements

• Sly Flourish
• Quick Strike

Feats

• Sap
• Stunning Blow
• Sunder
• Tendon Slice
• Trip

Epic abilities

• DC - Smite the Wicked
• FoTW - Boulder's Might
• LD - Lighting Mace, Volcano's Edge, Anvil of Thunder^{[Unverified"Anvil of Thunder" has not been verified in-game. Please verify it!]}
• SD - Executioners Strike
• US - Celestial Mandate (Couldn't test hate effect)
• US - Draw them out (Couldn't test hate effect)

Special attacks that don't strike through

Void Strike (In update 46)

TBD