How do you unlock a magna guard in Lego star wars lll?

Answer 1

First, you must find your way to the Separitist Capital Ship. When you are there, go to the far right. You should find an elevator. Go through there and you arrive in a room with a mission pad. If you Assaj Ventress in there, you have found the right one. If you already bought Assaj, then just go to the room you bought her in. When you access the mission pad, you will find the marker on Tatooine. Do the Story Mode and there should be two characters you have to be: Count Dooku and Magna Guard. Complete the level and you will unlock him. Good luck, this is the only way to get the Magna Gaurd!

Answer 2

You Need to beat campaign on JEDI MASTER difficulty