A stairway of arrows appears where you point your bow.

Encounter   ✦     Martial, Weapon
Minor Action      Personal

Requirement: You must be wielding a bow or a crossbow.

Effect: Choose 5 contiguous squares of a vertical surface within your weapon range that you can see. The DC for climbing these squares is reduced by twice your Dexterity modifier until the end of the encounter.

Published in Dragon Magazine 383, page(s) 50.