RTF is a global modification that replaces all towns in the game.

Well, in principle, Aranthir was a beacon of hope for the Necromancers.... By the way, how did things go with Mother Namtara during his reign?

bad... I think she was destroyed even before he came to power - under Aranthir, the Necromancers called the Great Namtara a giant spider living under the Fortress, but at the same time, the venom of this spider still turned people into liches; most likely, they performed powerful magic on this little spider before appointing it as Namtara.