"You take on the bestial fangs, sleek fur, and hunting grace of a panther. At the time you choose, you can make a nimble attack, darting across the battlfield to deal a bleeding wound to one of your foes." (PH2 155)
Daily Attack Power
Tags: Polymorph, Primal
"Minor Action"
"Personal"
"Effect: You assume the guardian form of the relentless panther until the end of the encounter. While you are in this form, you gain a +2 bonus to Reflex and a +1 bonus to attack rolls against enemies marked by you. In addition, you can shift 2 squares as a move action.
Once during this encounter, you can make the following weapon attack while you are in this form."
"Standard Action"
"Melee: weapon"
"Effect: Before the attack, you shift your speed."
"Target: One creature"
"Attack: Strength vs. Reflex"
"Hit: 2 [W] + Strength modifier damage, and ongoing 5 damage (save ends)."
"Miss: Half damage, and ongoing 2 damage (save ends)"