What weapon that can defeat the susanoo and what material?

You can use loeweberg or you can attack the back legs of the aragami with at least a 7 or 8 ranked buster blade

Just buy the like the blade of lindow and like a gun of sakuya all of htat will be critical.

Use The Blood Surge (upgraded).you first Destroy The Susano'o god ark like shield

Its just easy focus it's weakness like the mouth god arc

Use crush type weapons and focus on the god arc

Rigoletto x is my favorite

Use the esquire short sword..it's best on all situations...watch the moves of susanoo then find a way to make burst so you can double jump on it's blade(tip of the tail)...then slash it until it crush...it's really critical

Use the Wild sword Laoyang.
It has hold skill that paralyze the enemy

Use a high ranked divine weapon, and concentrate your attacks on it's god arc's. Also aim strong divine bullets at the head. I find that beating Arda nova a few more times (My fastest time killing it is 2mins 41secs) and creating the whole set, sword, sheild and gun, then using it against it thrashes it. I used to find the susano'o the hardest to fight, especially in difficulty ten. Really helps against ouroboros too (Fastest time 1min 23secs)

Just find an avatar friend and finish it off

Use the blood surge x (final upgrade) attack in susanoo's god ark

Find a friend, use diine equipment, destroy it. If you fail just try it again and again and again until you win