Worriz the Wolf is in the Eagle Interceptor. Select Eris and fire on the Interceptor. When Worriz fires back, move around to dodge the shots and then return fire. Keep this up until Worriz flies away.
Assemble some bricks on the right side of this area into a fan. Use it to soar up into the air and then glide down to the top of the building on the right side of the area.
Climb into the turret and open fire on the Eagle Interceptor. While you are firing, your shields are down. When Worriz starts firing at you, stop shooting and let your shield block the shots. As soon as Worriz pauses his attack, open fire again. Keep this up until Worriz flies away again.
Jump back down to the roof of the library and fight off some wolves while Worriz launches bombs at you. Keep moving as you are fighting to dodge the bombs. Then fire at Worriz in the Eagle Interceptor until he takes more damage and flies away.
Move to the left side of the roof and assemble another fan from a pile of bricks. Use it to soar over to another rooftop.
Ewar Character Token
Switch to Laval and move to the left side of the rooftop. Roar to break open a wall and enter a secret room. Attack a chest to get the Ewar character token.
As Eris, use the Chi pad to power up. Then soar through the boost ring to get on top of the Eagle Interceptor.
Press the Attack button rapidly to damage the Eagle Interceptor until it crashes and you have defeated Worriz to complete the level.