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To create a spell that can summon an angel, what can I do?
The first thing I thought was my own connection as a pseudo angel myself.
I do have a halo, which I obtained as a gift from Heaven by slaying a demon.
Not just the normal way though, the demon was killed permanently, so I think that's not something everyone can do.
Most of the time, apparently, people exorcize them and send them back to hell.
But I killed them, period, they were dead, finito.
So I guess it is much more differently at the end, a greater feat that Will of the Realm of Heaven believed was enough to give me such a power.
My halo has evolved as I slay demons from both Earth and Arcadia, and I can use my angelic powers in both worlds without issues either.
Now, Halos have their own Runes, Angelic Runes, which enhance my magical power based on certain elements, such as light, life, holy, and sunlight I think?