It would be Ferumbras.
A simple overlook on Ferumbras' Ascension Quest where he is about to get "godlike" power. 1
He gained access to Zathroth's library (either by favouritism and support of Zathroth or by attacking the library) 2
Even Knightmare has called him "that the greatest mage of all times " 3
The second Boss which is rising to the level would be Goshnar, who is known as a Necromant King and powerful enough to be able to resurect himself. 4
Goshnar speaks about himself "As a powerful necromancer I had fettered my soul in the living world and the realms beyond. I had prepared for my return and was confident in my power." 5
1. https://tibia.fandom.com/wiki/Ferumbras%27_Ascension_Quest
2. https://tibia.fandom.com/wiki/The_Ferumbras_Files_(Book)
3. https://www.tibia.com/news/?subtopic=newsarchive&id=2700&fbegind=9&fbeginm=10&fbeginy=2000&fendd=8&fendm=11&fendy=2018&flist=01111100
4. https://tibia.fandom.com/wiki/Goshnar
5. https://tibia.fandom.com/wiki/Flickering_Soul
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