Veil-Ordnance is a tool that can be used to quickly generate valid stager shellcode. Veil-Ordnance’s active developers are listed below. If you have any questions on how to use the tool, feel free to message them, or hop in #veil on Freenode.
The Github repo for Veil-Ordnance is located at: https://github.com/Veil-Framework/Veil-Ordnance
E-Mail: Chris [at] veil-framework [dot] com