Balthor Sigma Intervention
The battle saw a pursuit force of World Eaters engage in a hunter-killer operation against previously defeated loyalists which included a demi-legio of the Legio Osedax. On Balthor Sigma, the World Eaters use Super-Heavy tanks to hold the Legio Osedax at bay until these vehicles are destroyed by the sudden arrival of Eldar Titans. It's only when traitor-aligned Titans of the Legio Fureans fight their way through to reinforce the traitor's lines that total defeat is averted. At the conclusion of the battle, the xenos Titans vanish.