Ares: "You cannot save them Kratos. You gave them up in your quest for ultimate power. There is a price to pay for everything you gain."
Kratos: "Not that price... I didn't want them to die."
Ares: "No price is too high for what I OFFERED!"
To darkest depths I pledge my soul,
And crush my heart to burning coal,
To summon forth the deathly power,
To see my hated foe devoured!
— Eclipsa's Curse, Star vs. the Forces of Evil
Whomsoever takes up this blade shall wield power eternal. Just as the blade rends flesh, so must power scar the spirit.
"Magic isn't free. There's always a cost. [...] If there was a way to get magic for free, do you really think I'd have spent so much time sacrificing children to my dark gods? For spells, I mean. Obviously there'd still be sacrifices. A hobby's a hobby."
— Black Mage, 8-Bit Theater