Add Anvils to Trial Chambers

The Trial Chambers give lots of enchanted books as loot. I think it would be useful to be able to enchant our weapons within the chamber itself. It is almost as if we are upgrading our weapons to face the next trial. This also helps free up inventory space while fighting the chamber, as instead of having to store all those unstackable enchanted books in our inventory, we could just use them up to free space.