Star wars: Path of detruction
By Drew Karpyshyn
Des is taken to a secret sith academy where he learns the ways of the dark side and chooses his new name, Bane. But Bane is no ordinary apprentice. He sees the dark side in a different way. He wants to destroy the Brotherhood of Darkness and create the Rule of Two.
When Bane joined the sith academy, he spent many time in the Libraries of Korriban. He studied the old ways of the sith and grew in power with the knowledge of sith books.
Bane's lightsaber was given to him by his most favored master lord Kas'im for his victories in the ring. The lightsaber is different because of it's tilted hilt.
Before Des became Bane, he worked in cortosis mines to get cortorsis for republic warships. Cortosis is the hardest medal that even a light saber will take time to cut through. Des became extremely strong and lost his hair because of the hardness and poison of the cortosis ore.