Karsus' Avatar Spell, the masterpiece of Karsus, the mad great Arcanist of Netheril. He invented and used this thirteenth-circle super spell primarily to drag the Goddess of Magic from her position and replace her, seizing the Weave for himself.
Of course, the outcome had not been so good. One generation of Goddess of Magic had committed suicide to preserve the Weave's existence, while Karsus himself had exploded.
Like a madman obsessed with skyscrapers, he had skipped the first ten floors and built the eleventh directly. Using magic against the Goddess of Magic was equivalent to pulling away the ladder beneath his own feet.
It was said that the spell had been completely lost, but it had only been lost among the living. For Larloch and the others, who had existed in that very era, they had witnessed the Floating Cities fall and the Avatar Spell take effect. They were a group who understood its principles.
They were no longer people now, but liches were spellcasters too.
Faerûn's later Weave had only ten layers, so there were no longer conditions to cast the Avatar Spell. But the Council of the Sky's knockoff P2P Weave was different; it was more like a form of Magitech.
It was all a virtual energy network anyway. If you needed more "electricity" on your end, Sepulk would give you more "electricity" on theirs.
A group of Great Liches patched up the Avatar Spell, reducing some of its power while also lowering its output.
As one of the dead, Larloch was professionally suited to dealing with death. But he was not trying to seize this world's Death God's divine portfolio, nor was there any need to push the spell to the lofty level of the thirteenth circle. He merely needed to create a channel for dialogue.
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