Berossus
From Lexicanum
Lord Berossus was an Iron Warrior Chaos Dreadnought who was also the Warsmith of an Iron Warriors Grand Company based on the planet Medrengard.
Berossus and Warsmith Toramino were embroiled in a dispute with Lord Honsou, who had stole gene-seed from an Adeptus Mechanicus facility on the planet Hydra Cordatus. Lord Honsou reneged on a promise to share the geneseed with his fellow Warsmiths, leading to civil war amongst the Iron Warriors. Lord Toramino and Lord Berossus went on to besiege Honsou's castle, Khalan Ghol, for many months; Berossus bore the brunt of the fighting and lost thousands of soldiers.
Eventually Berossus met Honsou in battle during the latter stages of the war, where he almost killed Honsou with a siege drill. However, Honsous' Daemonhost bodyguard Onyx managed to inflict enough damage to Berossus' dreadnought form. His sarcophagus was opened by Housou, who proceeded to rip Berossus' head from the Mind Impulse Unit of the dreadnought and crushed for all to see. Berossus' troops then defected to Honsou shortly after his death.
