[JP] Nerofest: Boss Gilgamesh - Cu Solo (pre bug fix) 

They fixed the bug hours after I recorded this. (The bug isn't on the NA server)
GIMMICKS! As soon as the fight with Gilgamesh starts he will drain all of your NP gauge [front abd backrow]
He will debuff your NP damage by 50% [Bugged in this video to be nearly 100%] He will also gain a attack buff every turn and his crit chance is nearly 100%
Key to soloing this is not recasting Cu's dodge immediately. It's good to use your HP to buy a turn or two. Later in the fight Gilgamesh will have so much attack he will 100% to 0% you in one attack so you won't be able to get value out of your HP. Also letting guts proc from the CE early allows you to cast Cu's guts skill while you have enough resources left live long enough for guts to come off cooldown again.
The best strategy for normal teams seems to be either stalling and buff stacking a unit equipped with the event CE. The Mystic Code "Chaldea Combat Uniform" is really helpful for this. You can buff the unit turn 1 and switch them to the backrow. When they return to the front you can buff them again. If you time it right you can even use the Mystic Code's attack buff twice on them.
Music Used
Fighting of the Spirit - Tales of Symphonia
Eiyuu Ou - Fate Stay Night
Cosmic Air - Fate Extra CCC
Musubareru Sekai - Unlimited Blade Works [2010]
FGO Cu Chulainn once lasted 12 hours againist Gilgamesh now he gonna just kill em dead 2017 Nerofest Event Boss Lancer vs Gilgamesh old school