[The Mummy!AU]: Sherlock, with the disastrous help of his older brother Greg, stumbles across an ancient map that's rumored to lead to Hamunaptra, the lost City of the Dead. Said to house the wealth of Egypt. Problem is, Hamunaptra is meant to stay lost, and when the map is partially destroyed, they're forced to rely on a guide to take them there.

It's living in the vast sewers, whatever "It" is. Living there, hunting there, and devouring any human it can get it's hands on down in the dark. In the disgusting, murky waters of London's Sewer System, It calls home. Hiding. Waiting. And Sherlock is just the consulting detective to flush it out. (Dark!Mer Fantasy AU - Merlock With A Twist)