Werdna

He is the chief villain of Wizardry: Proving Grounds of the Mad Overlord. Five years before the events of the game unfold, he managed to steal a powerful amulet from Trebor the Overlord. Using the amulet's powers, he created a maze of ten levels beneath Trebor's castle. He then hid in the lowest level, guarded by the monsters in the maze where he researched the amulet for five years.

Werdna in Wizardry: Proving Grounds of the Mad Overlord
When the characters finally meet him, Werdna is close to unravelling the amulet's final mysteries.

Werdna in combat (Tactics)
The wizard is the characters' ultimate opponent, and surely the toughest one in the whole game. Thanks to the powers of the amulet, he can resist most magical attacks, while being able to cast all mage spells. He is also accompanied by some very powerful monsters.

It must be the characters' highest priority to take him out as quickly as possible. To achieve this, some of his allies have to be killed so that Werdna can be reached by the fighters. Brute force or the ability to kill instantly work best to overcome Werdna.

However, to deal with his allies effectively, at least one mage should be able to cast the Tiltowait spell.

It is also necessary to have at least one priest in the party capable of powerful healing spells such as Madi.

Werdna in Wizardry IV: Return of Werdna
A powerful wizard like Werdna is hard to kill. In fact, the heroes of Wizardry I defeated him, but they were not able to kill his spirit. After many years of deathlike slumber, Werdna awakes in a mausoleum. He is very weak and he has to regain his strength.