User blog comment:Han Draco Rokan/Assistance Required: Squads, Items and Spheres for Cobalt Spirit's Waking/@comment-26399146-20150718071722

I just finished this Grand Quest using

Cardes lead (Malice Jewel)

Kanon (Legward Gem and Sol Creator)

Elimo (Drevas and Evil Shard?)

Medina (Legward Gem and Queen's Tear)

Elza (Medulla Gem and Heavenly Bud)

Cardes friend (Medulla Gem and Refined Jewel)

Spheres are off of the top of my head.

Having double Cardes/Cardes and 6* Grahdens friend plus mitigation plus guarding allows for units to survive Graham's single target nuke (unless your mitigator is hit). Just make sure to turn count the 10 turns. After the first turn nuke, you can also have a 75% mitigation UBB activated to survive. Then just make sure to not get stuck in the Angel Idol loop (I used Medina's UBB to nuke down Graham after revival).

After looking at your units though, I noticed that you don't have Cardes. I'd advise completting Trial 004 and leveling up Cardes first before attempting again (Mine's BB though was still only level 1). Also maybe wait for Tesla to get 7 star.

https://www.youtube.com/watch?v=NFGPKsFy67o

Here is the video made by Ushi that I refrenced to alot in beating the Grand Quest myself. He mentions and explains a bunch of tricks to defeating Graham.

I know that this isn't the greatest help, but I hope it maybe explained a few things to you. Good luck!