Gortash's, "I have no need for an ally who gives away their power at the first ask. I have enough underlings. I want an equal"
Astarion's "My most beloved spawn."
Astarion's "First we'll take Baldur's Gate. Then we'll take the world. We'll dominate it until the sun itself melts and then we'll give ourselves to the night."
Gortash's "We could have moved mountains, we could have shaken the planes."
Durge could have ruled the world with Gortash, but who they were as a person died, and then no matter what they do Gortash is doomed to die, and all who's left to rule the world with is someone that will never, ever want them as an equal