Gives Gothmog a mount/dismount power at level one. He has access to all his abilities and can capture buildings and all that.
If you want a mounted Gothmog without downloading a big mod, well then here you go.
*Update* Now when mounted, Gothmog is vulnerable to pikemen.
*Found out why Gothmog is so overpowered. He used a special weapon instead of his default that gave him a faster attack speed and more damage. Fixed that. He no longer attacks at the speed of light and doesn't kill five guys at once.*