Gothic/Banishment from the Old Camp

When you head to the Old Camp to deliver the message to the Mages of the Circle of Fire you'll see a strange sight: both gates are shut and heavily guarded. If you approach they'll say you can't come in, and, if you were a member of the Old Camp (regardless of whether you were a Guard or a Magician of Fire) they denounce you as a traitor and chase after you.

It isn't too difficult to outrun them. Go around to the rear gate until you see Diego. He explains the situation: the Old Mine collapsed when water got in. Gomez, desperate to maintain the constant supply of ore to the outside world that is crucial to his easygoing life, decided to launch an attack on the Free Mine and seized it, killing everyone there. When the Magicians of Fire opposed this plan they were executed.

Diego wants you to track down three others to have what he calls "The Meeting", which takes place in an undisclosed location. This quest is optional, so it doesn't matter if you can't find all three.

All you can do is head back to the Magicians of Water and tell them the bad news. They'll let you join their camp (if you were a Guard, join the Mercenaries. If you were a Magician of Fire, join the Magicians of Water). With no other choice available, Saturas will send you to find Xardas the Necromancer.

Note: if you use a scroll to transform into a Meatbug, you can crawl under the closed gate of the Old Camp. You may need to dispatch that gate's guard to avoid them attacking you. As a Meatbug, you can wander around the perimeter areas of the Old Camp safely and take note that all outsiders in the camp were killed. They even killed Kirgo! If you transform into a human again, guards will begin attacking you. Meanwhile, even as a Meatbug, a creature which no other creature in the game naturally attacks, it's not possible to pass the gate into the castle - Thorus and his guards will attack.