This realy works 100%
just follow the steps correctly

Step 1
Build a Forge

Step 2
Create a Unclean One

Step 3
Upgreade or click Silvered Steel in the forge

Step 4
While upgrading the Silvered Steel, enter Unclean One in the Forge

Step 5
If you see the Unclean One waiting outside if the forge,
click the cancel button or the X button on the bottom right of the
forge many times

Step 6
Finnish