Enemies in the center of the area are stunned, while enemies on the outside are slowed.
Try using Onslaught of Shadows or Summoner Spells such as Ghost or Flash to maximize this damage.
Striking a champion or epic monster enables Rakan to heal his allies.
Udyr has four basic Abilities that he may use to swap between Stances.
These grant experience, restore mana, and provide out of combat Move Speed.
Try having your team stay spread out until he's used his ultimate.