There is a trick to the 5 General battle, but if you are not careful you will end up fighting more than 1 at a time.
There is an order to fight the generals so that you can 1v1 each one, reducing the chance of you dying by being mobbed.
This is the General Order:
1. Eris (bottom right) uses fireball
2. Davil (bottom left) uses rain
3. Rayno (top middle) uses blast and volley
4. Berro (top left) uses Multiple Fireballs
5. Maxig (top right) uses Chain lighting and Shock
Note: if you stay too long on a general, the next one in order will attack you. Also, once you kill one, if you wait the same will happen, the next general will attack you.
If you get too close to another general, they will attack you as well.