I started last month with KH-Project and my main element is dark. You possibly know that the next dark event is months away.
That's my grid after one month disaster farming:
It was pretty annoying to farm those things...
All weapon, besides Dark Amaterasu's weapon, have a Skill level of 20(max SL). Just need to max Dark Amaterasus dual skill Weapon because of Assault (middle) + Defender (middle).
After that I will reach 114% Assault and 42% defender. The problem is I don't have a assault weapon for Jeanne. Therefore I am using Disaster Defender.
The only thing that sucks is that I don't have a good dark Eido... Just 3LB Medusa >.<
Therefore if his main is fire then just go with disaster weapons and wait for fire events... I am doing the same with dark.
Until I can replace those SR Disaster weapon I will now start to upgrade my wind and light grid since I got some SSR Weapons from events.