Already posted this elsewhere. Figured id post here incase anyone had figured this is out by now.
This method works for any class that can be the Minotaur race.
1. Load up Cheat Engine or any memory editor.
2. Run DAoC and go to character creation.
3. Start creating a character (do not select minotaur yet).
4. Set the gender to female.
5. Search for a byte of 1
6. Set the gender to male.
7. Search for a byte of 0
8. Repeat steps 4-7 until you see a pointer address (in Cheat Engine the address will appear in green)
9. Save the address
10. Create a new character or use an existing character of the Minotaur race.
11. Go to the character appearance screen where you change height, face, etc
12. The saved address should have the value of 0 since Minotaurs can only be male.
13. Change the value to 1
14. Change the face slider to update your gender
15. You should now be invisible.
16. Start playing and have fun.
*You will see yourself as a Briton however to everyone else you will be invisible.*