This is fucking awesome! This is the first time I have seen a post from someone evoking a being from KoF in the manner described in the grimoire 
Sweet!
i don’t know if you have seen the only other post about Fastos from former member Musta_Krakish but he provided an incantation in that one too:
Altash Faltu Kanta Exune (spirit’s name) kalla kama Faltu - to aid in seeing and hearing spirits.
I look forward to anything else you share about your work with this being