Thread:AngryLance/@comment-28144855-20190915035744/@comment-28144855-20190915054143

If your character resides in the MGE world then you're good. You can say it comes from the Watcher Andrej's Earth if you want as well. Since, (Spoilers, but not plot important other for my char development) his Earth was visided from way back in the past from interdimensional visitors. It is how he met Sylvia, his Elf Waifu, so an otherworldly symbiote is not so out of the place. Hell, her kind are the Divas of legend (Diva is archaic for Djevojka meaning girl/young girl/maiden but also a species of Fairy like entities that Built my RL hometown's Arena)

As for your servant, the only rule is he/she's just a fraction of the full Heroic Spirit of which they derive, so it can't be as powerful as original. It can get more powerful troughb story as you grow more powerful, as you basically supply the energy for her/him. Anything else is your job, looks/personality/fighting style/Noble Phantasm. We can treat it as an alter. Or you can pick a canon one, your choice.