Greater Drow Nobility
You have mastered the lesser spell-like abilities of the drow, demonstrating true nobility.
Prerequisite: Cha 13, Drow Nobility, Improved Drow Nobility, able to use drow spell-like abilities, drow.
Benefit: Your detect magic spell-like ability is now constant. You may use your dancing lights, deeper darkness, faerie fire, feather fall, and levitate spell-like abilities at will.
Source: Advanced Race Guide, p. 105