This is the steps I used for Xao:
(unchecked)
1st: def
2nd: def
3rd: def

(checked)
top pri: def
2nd pri: blank

your party HP<0 (blank)
your party SP<500 (stone wall)

For the water, it use the same skills as normal bursting but instead of water shield, its soul dodge.

The fires uses the same skills as normal bursting.

The cows attack with their back kick.
I gave Xao a mysterious scroll so she can have enough sp to stone wall.

I managed to burst xao until shes 65 with these steps, but took a break and then came back and tried bursting her again, but it didnt work.

I tried every steps I can find on google, but non work.

Today, she end up not stonewalling anyone.

What seems to be the problem?
Thanks.