Verified answer

Restart the whole level. Then, try to search for healing gems/fountains before the fight

Good luck!

Ultimately if there are no life gems around or health fountains and you can't beat him without getting hit then your best bet is to restart the level, but Olrox is pretty easy as soon as the fight starts you light magic and then a holy water to use the shield then attack to regain health.

quit and read tom sawyer.