Xyan (Penal World) – Xyan is a hostile world whose atmosphere is covered in sulfurous fumes from the bubbling hot springs scattered across its surface. There is frequent tectonic activity caused from the planet’s active core. This world also contains large swamps full of animal life that has adapted to its intensely acidic environment. The air on this world is breathable, though it tastes foul. Those that stay on this world have scar tissue in their lungs, but can tolerate the highly sulfuric atmosphere and diet better than an off-worlder. Their vision has also adapted to the haze of their environment somewhat. During the age of the Jericho Sector, this world became a penal planet. Millennia later, the planet’s population were the descendants of these amoral humans that survived the brutal conditions of their world. When reunited with the Crusade they did not respond well with reunifying with the Imperium.