nice

So I read this. I thought to myself, 'self, how can I explain my opinion of this story in an efficient and concise method?' And only two words came to mind.

Update When?

A fairly interesting beginning. I'll look forward to seeing what you create from it.

Run from this fanfic before Zeltreth appear behind you offering candy or an apprenticeship.

A minor notes: though Gilgamesh is stronger than Emiya, he is merely an owner of the weapons, and lacks the skill to use them correctly, unless they happen to be his two favorites: Ea and Endiku, which means that Emiya can overpower him through sheer skill (drawn from the histories of the weapons themselves).

Furthermore, Unlimited blade works can produce and fire weapons faster than Gate of Babylon

Oooh, this is going to be Good, wonderful.

I think you vastly under estimate Zeltretchs giggle it doesn't just send sane men running in terror. The Dead do not simply fear it. For Zeltretchs giggle is do utterly horrifying that for a sane man to hear it is an oxymoron because they are made insane just due to it. For Zeltretchs giggle is so scary that the Dead give up all their goals and Die a seccond time just to get away. FOR ZELTRETCHS GIGGLE IS SO TERRIFYING THAT GAIA HERSELF SHIVERS AT EVEN THE MENTION OF IT.

BTW

Interesting premise.
Not sure what you mean by Gaia exhaling counter guardian, it's Alaya who summons them and powers them.

Whoa. Definitely an unusual premise. I shall watch with interest.