Udyr gains 15 / 20 / 25 / 30 / 35 % increased movement speed and ignores unit collision for 2 / 2.25 / 2.5 / 2.75 / 3 seconds. Udyr dashes slightly forward when attacking a target while the buff is still active, and only when he stuns the target.
While in Bear Stance, Udyr's basic attacks stun the target for 1 second. This effect cannot occur on the same target for 6 seconds.
The mana cost of this ability decreases with Udyr's level, down to 33 mana at level 18.