S is for ... Shadowlands
The Shadowlands is where people’s souls go when they die. Death reigns in this realm. The Shadowlands does have an entrance to the mortal world behind a waterfall on the edge of Blackden Barrens and Merrilea Sea. And even Death can die, but the one who kills Death will become the next Death.
The Shadowlands feature most in "Lady Death" from Women of Foxwick.