The Handsome Sorcerer is encountered in Dragon Keep. This is his second form.
The Necrotic Sorcerer can summon up a trio of Animated Skeletons.
He will launch Flying Skulls that will dive bomb you.
He can launch himself in the area and land with a close burst of Slag damage. Jump as he lands to avoid this.
The Necrotic Sorcerer can lay a Slow Trap that will severely hamper your movement.
As flesh and blood, he is weaker to Fire-Type attacks. He can, and regularly does, make a shield around himself. Just blast that thing away with Shock-Type damage.
His critical point, needless to say, is his head.