You gain special bonuses for fighting with specific things in your offhand while Single Weapon Fighting.
If you have nothing in your offhand, your ability score modifier contributes 25% more to your melee damage.
If you have an Orb or a Runearm in your Offhand, your Vorpal strikes cause you to gain Versatile Empowerment.
Versatile Empowerment: Your spells automatically crit for the next 5 seconds. Cooldown: 20 seconds.
Update 48.4 states 20 seconds duration for Versatile Empowerment.
|Feat||Requirements||Attack Speed (Cumulative)||Melee Power (Combat Style Bonus)||Other Benefits|
|Single Weapon Fighting||0 BAB, 2 Balance||10%||2||-|
|Improved Single Weapon Fighting||6 BAB, 4 Balance||20%||4||1.25x ability modifier damage scaling|
|Greater Single Weapon Fighting||11 BAB, 7 Balance||30%||6||1.5x ability modifier damage scaling|
|Perfect Single Weapon Fighting||Level 26, 28, or 29 Epic Destiny Feat||-||10||1.75x ability modifier damage scaling, Vorpal threat range increased to 19-20|
|Offhand Versatility||8 BAB, SWF||-||-||+0.25 ability modifier damage scaling while single-weapon fighting with empty offhand|