Corrupt bonecharms are rare and powerful, offering exotic Traits but they are also unstable, and also possess negative Traits. Additionally, you cannot learn the Traits from Corrupt bonecharms.
With the Bonecharm Crafting Enhancement, you can craft new Bonecharms by sacrificing Bonecharms and Runes you’ve found in the world to learn new Traits and obtain Raw Whalebone. However, there is a chance of corruption whenever you craft bonecharms with more than 2 traits.