Homeworld gets canonically destroyed by humanity. The entire show is just Steven hallucinating as he slowly dies in the mud, hearing Kevin and Connie fucking in the former's Ford F-150. Homeworld was hit by a Space Wolf kill team, an entire army of Drusian crusaders, a force of Kriegsmen, and a full on auxiliary unit of Abhumans... And one unknown astartes named Hatemongerer. The gems, being aliens, were completely exterminated.