Invulnerability
From Worlds of Carnage
Invulnerability can be learned up to 80% from the Lord of Cimmura. He is only accessible after completing the first part of the Angorn quest. Speak with the Jailer in Angorn about a trapdoor/cell to start this quest. Additionally, the spell can be learned from a tome acquired from the Minea Vampire Quest. This quest can be a bit challenging as you help the captain fight off vampires and kill one final vampire (best to fight him during the day) to acquire the tome.