Fiendish Darkness

You can use your darkness spell-like ability more often.

Prerequisite: Darkness spell-like ability, tiefling.

Benefit: You can use darkness three times per day as a spell-like ability.

Normal: Tieflings can use darkness once per day as a spell-like ability. T ieflings are nothing if not cunning and skilled. When adventure calls to such tainted souls, individuals put their mettle to the test, calling on a host of unique abilities and powers that give them an edge in combat. At the GM’s discretion, other appropriate characters may make use of some of these new feats.

Source: Blood of Fiends