Target
The tower defense ending is not magnificent at all. It is in fact boring. When the two forces engaged, the blue team who should have played a defensive role with the excess number of earth element users they have, the commander of the blue team couldn't stay calm and went on being offensive.
His soldiers are aggressive and suicidal. Although he did do some significant damage to the red team, he still suffered more.
After he calmed down, he finally realized the mistake and used all his brain and forces to create a deadlock.
The deadlock worked quite well for a short period of time. But the problem arrived when the water element users who are using the stream move towards the tower. They could easily attack from the back of the tower, but taking advantage of their positions.