Q. How does the Invasion work?

A. To succeed in the Invasion, you must exploit the weaknesses of the Corrupted Spirits.
 

There are four types of Corrupted Spirits, each with a specific elemental weakness:

1. Wan Shi Tong: Weak against Waterbenders

2. General Old Iron: Weak against Earthbenders

3. Hei Bai: Weak against Firebenders

4. Dragon eel: Weak against Airbenders

Target their weaknesses and defeat the Corrupted Spirits!