Seeping Darkness (Teamwork)Source Inner Sea Races pg. 209
Your innate magical darkness seeps through your skin and strengthens when you’re near another creature whose soul is as wicked as yours.
Prerequisites: Drow, darkness racial spell-like ability.
Benefit: Whenever you’re adjacent to a drow ally who also has this feat, you can spend a move action to gain concealment (20% miss chance) for 1 round.