Twilight the devourer

she wasn't always the devourer infactbshe used to be very friendly and kind, 10 years ago right before her reign a parasite from queen chrysalis went up her ass and not long after it compelled her to absorb her friends with her arse thus combining their souls and making them powerful enough to combine with the princesses. after having the power of the heroes of equestria and the sun and moon she took over all pony filled regions of the world and shortly after consumed queen chrysalis and half of her army making her even stronger, she used the other half, seeing as they could do something, for waiting on her hand and foot but she made one named thorax, the best friend of spike the dragon and the nicest changeling of them all, her personal pet and sometimes sextoy.

a world where twilight fuszied with her friends and some if the strongest ponies on earth where she became queen of all ponykind.