Uncharted Plains - 10

Cutscene
The Winter Soldier has been defeated. The door to the next cave, Stormy Sea, has been unlocked.

Strategy
Have the following birds:
 * Red as Paladin
 * Matilda as Princess
 * Jay, Jake, and Jim as Treasure Hunter

Now follow the guide below.
 * 1) Remember that Winter Soldier will always follow a set pattern below. He will not break from it.
 * 2) Activate Ice Barrier.
 * 3) Attack.
 * 4) Have Princess attack the Winter Solider so that he has to attack the highest-health bird. That way, you can also focus Princess's Royal Aid on Paladin as shown in the step below. The damage from the cave effect should be covered easily by Holy Strike.
 * 5) When Winter Solider is about to attack, use Untouchable on Paladin to reflect the stun to stall for 2 turns and Devotion on the target.
 * 6) Repeat until Winter Solider is defeated. Just remember that the stun from the cave effect cannot be neglected by Untouchable or removed with any skill that removes harmful effects.