spirits were not able to defend water tornados. so spirits had to ran away to world of magic. There they hede in the cave of andes mountain.
Spirit king said"Our many spirits had been killed. we have to increase the number of spirits in our army".
There they see very sad animals. From their power they understood that the people try their magics on them and disturbs them. spirit commander said"we can convert these animals to our spirit army and I hope that they will give us permisson to change them into our spirit army".
As spirits have the power of converting animal into spirit with their permission.
Animals then were converted into spirit army.