Another idea just came to mind:
Arcane Archer Bush: Elven wizards sometimes magically augment traditional archer bushes, granting them additional benefits. The thorns of an arcane archer bush are treated as magic weapons for the purposes of overcoming damage reduction. Once per day an arcane archer bush can fire a thorn volley at each and every target within range, to a maximum of X targets. Each attack uses the arcane archer bush’s highest attack bonus, and each enemy may only be targeted by a single thorn volley. Using this ability depletes all remaining thorn volleys. CR +1.
Too cheesy?