You cannot skip the fight.
1. Try again with the right fight patern and max. Heal/Mana Potions. Max out your Sword.
- Use DEFEND when he is charging up. If the multi-Hit-spell hits you, It's gameover. Even with godlike stats at level 15 you still must DEFEND his MH-Spell. If the MH-Spell does more than 25 damage while defending -> Your Defence/Endurance Stat is to low.
- If you are using a Charm-Build for your MC, the first Phase is weak to FLIRT.
2. Savescum: If your Level, Defence or Endurance Stat is to low you need to savescum your way out. Savescumming is more efficient with an mid-high Agilty Stat. Use Quick Reload when he enemy hits you. Use Quick Save when the Boss miss
3. Roll_back: If your level is rather low and you hate Savescumming (or your agility is too low to make savescumming work) reloard or Roll_back before the War ends. When you got the last mission to end the war, or before that, POWER-LEVELING!! Flirt or defeat the Bull Warrior and the rogue Lizard until your are level 15. Make sure you rise your Endurance to at least 7.