You invoke the rune of the warded path, a mark once used by the gods to ensure the safety of secret ways through the planes.

Encounter   ✦     Divine
Minor Action      Close burst 5

Effect: Choose up to four unoccupied squares in the burst. Until the end of your next turn, you and your allies don't provoke opportunity attacks when leaving those squares.

Published in Player's Handbook 3, page(s) 108.