<p>Technically, Akasha. For the moment. Alaya and gaia both behind. </p><p>
</p><p>Allmighty God (Jehovah, Allah, etc) are but one god in nasu, but we don't know where he is in term of pure power. However, it's suggested that he si quite amongst the most powerful gods. </p><p>
</p><p>Zefar need a lot of gods to defeat him, so he is quite good placed too. </p>

<p>However, even them have their limits, there is no True Almighty One for the moment (for exemple, Akasha can be manipulated) </p>

Does Allah even exits in Fate Verse?

<p>Allah/Jehovah/God exist, they are the same "god". You can see it with Jesus, Moise,  Arash and Solomon, that have Noble Phantasm granted by "that god" himself. However, if he is a powerful god (Moise VS Ramses is kinda Him VS egyptian gods), he is not all-powerful in the fate verse, because his mystery is lower than most gods (in other words, he is quite recent among humanity, and gods are conceived by Humanity). Powers granted to Him (all-powerful, omniscient, etc) are kinda traditionnal power of gods in all myth after all. There is some theory taht make him kinda Alaya, because of all stuff about Jesus and the servants, but we lacks info. </p><p>He is kinda like a big boss among the gods with Amaterasu, Zeus, etc, probably (after all, his image is inspired by Zeus, mythologically speaking) </p>

<p>Technically void shiki could be considered the most powerful as she can 'kill' anything with the mystic eyes of death perception, but she is limited by the capabilities of shiki ryougis body so she could possibly kill anything she can see but if it is beyond a certain threshold it would result in her own death, maybe. </p>

<p>And Shiki can"t exactly "kill anything". As proofed by Melty Blood, she is unable to kill some things too great above herself (gods notably), as seen when she face Arc in Melty Blood and doens't see her lines. </p><p>
</p><p>Also, she depend of Akasha, however we know from  a certain time that Akasha herself was made by primeval goddesses of life and earth (like Gaia herself in fact), placing her behind all of it. </p>

<p>Akasha is a thing, a record that encompasses the entire universe as well as all of time, it's not a being with an identity or a will. </p>

<p>That's right, it's "Void" himself (it's why she is surnamed Void Shiki). </p><p>
</p><p>However, I would recommand you to check this : http://typemoon.wikia.com/wiki/Divine_Spirit </p><p>
</p><p>Notably about Balor,  Bodhisattva and Earth Mother Godesses. The first entity hold greatest power than Shiki from his mystic eyes, and the second and third are above Akasha. (Bodhisatva is kinda more or less implied during extra, the second is admitted as they are Akasha's creator). </p><p>
</p><p>In factn the only concious that are in the record and act as a "conscious" is Alaya. </p>