Two Weapon Fighting

Usage: Passive
Prerequisite: Dexterity 15

Description

Two Weapon Fighting reduces the to-hit penalty when using two weapons at the same time, and increases the chance of a secondary (off-hand) attack.

The attack penalty for your primary hand lessens by 2 and the one for your off-hand lessens by 6, so it becomes -4 (main hand) / -4 (off-hand) (instead of -6/-10 without this feat).
If the off-hand weapon is light, the penalties both decrease by another 2 points, down to -2/-2 (instead of -4/-8 without this feat).
For wielders of non-light weapons, Oversized Two Weapon Fighting was once recommended to bring their attack penalty down to -2/-2, but with the current game math, this is not necessary (or still recommended) - there are better feats to take.

The default chance to proc an off-hand attack is 20%. (Prior to Update 5, an off-hand attack would be predetermined on certain attacks.) Two Weapon Fighting increases the chance to proc an off-hand attack by 20%, bringing the total chance to 40%. The Improved Two Weapon Fighting feat increases the percentage chance of proccing an off-hand attack to 60%, and Greater Two Weapon Fighting increases it to 80%..

Handwraps users don't suffer attack penalties for fighting with two weapons, but this feat grants them the off-hand proc bonuses.

Additional chances to proc off-hand attack

Sacred Fist enhancements - Deft Strikes (+3/6/10%, antirequisite: Shintao version)
Shintao enhancements - Deft Strikes (+3/6/10%, antirequisite: Sacred Fist version) and Meditation of War (+10%, in Wind Stance)
Tempest enhancements - second and fifth core ability (+10% each)
Vistani Knife Fighter enhancements - Double Daggers (+20%, daggers only)
Razorclaw Shifter enhancements - Second Claw (+3/6/10%)
Tabaxi enhancements - Feline Versatility multiselector (+5%)
Wood Elf enhancements - Forest's Versatility multiselector (+5%)
Fury of the Wild - Wild Weapons multiselector (+3/6/10%) and Wade Through multiselector (+3/6/10%)
Grandmaster of Flowers - Hail of Blows (+5%) and Legendary Flurry of Blows (+3/6/10%)
Two Weapon Specialty feat (+60%, requires: level 31 and a greater weapon style other than Two Weapon)
Raid weapon set with two Brilliant Crescents (+20%)

There's no benefit of having more than a 100% off-hand strike chance.

Hits with a TWF character's offhand weapon only receive half of the applicable Ability bonus to damage.

Notes

TWF provides no benefit to the use of thrown weapons.
TWF provides no benefit to the use of two ranged weapons - in fact, it is not possible to wield two ranged weapons simultaneously in DDO - but see Inquisitive enhancements.
A ranger is automatically entitled to Two Weapon Fighting at 2nd level, even if he does not have the prerequisite for it.
Single Weapon Fighting is mutually exclusive with Two Weapon Fighting.
Fighters may select this feat as one of their fighter bonus feats.
Monks may select this feat as one of their martial arts feats.

Feat	Requirements	Offhand Strike Chance (Cumulative)	Other Benefits
Two Weapon Fighting	15 Dexterity	40%	Attack penalty reduced to -4/-4 from -6/-10 (Attack penalty reduced to -2/-2 if offhand is a Light Weapon)
Improved Two Weapon Fighting	6 BAB, 17 Dexterity	60%	N/A
Greater Two Weapon Fighting	11 BAB, 17 Dexterity	80%	N/A
Perfect Two Weapon Fighting	Level 22, Epic Destiny Feat, Two Weapon Fighting	N/A	Your offhand attacks now doublestrike at 65% of the rate of your main hand, versus the base 50%, up to a maximum of 65%.
Oversized Two Weapon Fighting	12 Strength, Two Weapon Fighting	N/A	Attack penalty reduced to -2/-2
Two Weapon Defense	Two Weapon Fighting	N/A	+2 DR when actively blocking and dual-wielding. +1 AC, +5 PRR and as +10 MRR cap when dual-wielding.

Two Weapon Fighting