Commanding a small fleet, Gantulga's forces were not part of the Chondax Campaign when the Heresy erupted. Instead, they arrived at Neryx and saved a small Iron Hands contingent under Eeron Kleve from the Sons of Horus. Learning the truth of the Heresy, Timur joined forces with the Iron Hands, teaching them the ways of the White Scars and becoming friends with Kleve. The duo eventually led their forces through the Ruinstorm to Macragge, where they became part of Imperium Secundus.
- Timur's name is derived from the real-life Mongol warlord Timur