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It's the Imperium of MAN not the Imperium of THEY.
(hexbear.net)
Tabletop, DnD, board games, and minecraft. Also Animal Crossing.
3rd International Volunteer Brigade (Hexbear gaming discord)
Rules
The Indomitus Crusade books starting with Avenging Son have a lot of the Guilliman grumbling scenes but a lot of it is just fairly generic Space Marine schlock. Watchers of the Throne is about a Custodes and a Sister of Silence in almost a buddy cop kind of match up and the second book delves a lot into the machinations of Imperial politics following Guilliman's return.