The mobs in this stage are all Sacred Beasts. The only way to deal damage to them are through Sacred Beast Slayers or fixed damage from Poison. You will be in each Stage for a long time so you want to mitigate damage as much as you can. Have mainly Wood monsters to mitigate damage through Elemental Effectiveness. The Sacred Beast Zombie will revive mobs every turn. They will also prioritize in reviving other Zombies first so you have to defeat all of them in one shot.