Old armor pillar and painting
In the “Robot Servant” mission, as you approach the temple, you can see multiple armored busts in the arena. These busts illustrate an older variant of Space Marine power armor, known as the Mark III Ironplate, from the Great Crusade era of the 30th and 31st centuries. This took place before the Horus Heresy, so it was a time when the Space Marine Legions mostly got along.
These details also match the paintings on the walls of the Temple of Thasis, which depict Space Marines fighting to unite the galaxy during the Great Crusade. The artwork is reminiscent of artwork from several books in the Horus Heresy series, including an artwork titled Abahor created by Sam Wood in the book Heretic Visions.
