Lament For a [Hell] God

I used to be a Hell God,
but now I'm stuck on Earth,
using people's brains to cure my weaknesses.
I could have gone back,
it wouldn't have done much harm.
All I wanted to do was to go home.
But I was stopped.
By her.
That slayer was the one that stopped me,
and now I have no chance of getting back.
I had everything,
including my key.
But I blew it,
I blew my only chance,
my only chance to go home.