Inspired by Chandor, I've been levelling up a full party (wizard, archer, 2 knights) and finally got to the point where I could do the 20 gold dragons in the arena. It's still iffy killing them all and I spend half my time repairing things. One time I probably waited a little too long and the majority of everybody's items were broken. I have several artifacts and as I was repairing I noticed that none of those were broken, so I started keeping track. I went through it 3 more times with lots and lots of broken items but none of the artifacts ever broke. Could be a coincidence but does anybody know if they are unbreakable?