Osiris

Osiris is a harsh and arid desert world and serves as the Adeptus Astartes homeworld of the Guardians of Osiri Space Marine Chapter.

Background
Osiris is a scorching desert world characterized by the gigantic network of underground tunnels that pass through the entirety of the planet. One of the most famous type of animal native of the planet is the apex predator named by the population as the Vali, gigantic quadruped reptiles that are larger than a Space Marine. The population of Osiris live on small hive cities that are spread throughout the deserts of the planet. But are also well connected by the network that they use as a easy mean for transportation.

Fortress-Monastery
Different than most of the Fortress-Monasteries, ' Galdhøpping ' was constructed inside of a mountain, bearing many rooms and secret passages inside of it. From the outside the fortress seams to be only a mountain with gigantic holes on it. But inside the mountain has an enormous cave system connecting each of the Chapters bases around the world. The holes on the outside are held by Astartes day and night and its where all the defense weapons are located. The tunnels of Galdhøpping go for kilometers leading each to a hundreds upon thousands of rooms. In the bottom of it resides the 'cursed' 11th Company, where they train day and night waiting for the time that they will go into battle.