I finally figured the best way to beat the strongest and hardest creature to kill in entire Conan Exiles the Giant Spider with 0 death(without using bow or AI or glitch)
just need more than 10 ambrosia (or aloe extract) + 10 antidote + 40 Vitality + 30 Grit + 1 hand weapon and shield + 1 legendary weapon repair kit (for shield)
And I finally did it! 
shield is OP!
but I am definitely gonna stick to killing White Tiger, Locust Queen to get keys faster after launch since we don’t need shield to kill those things xD