Intensify Darkness

(Drow of the Underdark, page 50, DnD 3.5)

[General]

By extending your effort, you can expand the area of your darkness spell-like ability.

Prerequisite

Darkness as a spell-like ability

Benefit

If you spend a full-round action to use your darkness spell-like ability, you create deeper darkness instead. You also gain one extra daily use of your darkness spell-like ability.