Greater Two-Weapon Fighting

(Epic Level Handbook, page 69, DnD 3.0)

[General]

You are a master at fighting two-handed.

Prerequisite

Improved Two-Weapon Fighting, Two-Weapon Fighting, Ambidexterity, Base attack bonus +15

Benefit

In addition to the standard extra attack you get with an off-hand weapon and the second attack with the off-hand weapon provided by Improved Two-Weapon Fighting, you get a third attack with the off-hand weapon, albeit at a -10 penalty (see Table 8-2: Two-Weapon Fighting Penalties in the "
Player's Handbook":rulebooks/forgotten-realms-30--6/players-handbook-30--106/).