Slang becomes his own character when Sing and Sang fuse together.
When Sang died, Sing chose to fuse together one last time never to come apart again. Siang met his end at the hands of Scorpion.After Scorpion gained the power of a medallion that could animate the dead he used it to create an army to serve Shao Kahn the very person that had given him that medallion. Scorpion re-animted the body of Siang to do Scorpion's evil biddings.