Team Comp for Goetia

Bond level is important for Goetia. Either level up your servants bond or use someones herc with bond CE. There's Herc solo videos out there.

Level a David, level a Mephisto.

Mephisto 3rd skills+David 2nd skill=Goethia nuke nullified, and you keep your frontline.

Or just grab a support MLB Kaleidoscope Jalter, her NP buff blocks as well =P

Easy mode: just buff your Herc with Waver+support Merlin. Extra bonus if you have Anniversary Blonde Mystic Code...add a Bond CE and is 100% sure you will win.

If you just want to just clear it to continue story, pick a Bond CE Heracles from support...or your own if you already have it. That's the easiest way possible, not even Merlin can make it this easy.

If you want to do it the legit and tryhard way you will need a actual strategy or just use your three command spells to finish him off. You can try to buff block his 1st NP or just let the first three servants die and focus on the last three like Waver-Heracles-someone else (Nero?).

if i was you i would level my servant.
I know you are close to the end of part 1 and you want to see how it is, but, i think clearing the game with your servant is more fun.
But thets up to you.
If you want to clear him easy, just grab any herc, cu alter, deam even ilyesvild can solo the dude. As long as he is bond 10 the poor goetia has being soloed by more servant then any before.
Even i soloed him with my cu alter.
If you do thet, just put the atlas mystic code and put him in your back line. Alone