From the character screen there should be an option to "test character", which would take you to a single special dungeon that has a single wave of five characters, one of each class (gunner, assassin, sentinel, warrior, magus), with no bonuses and wearing no talisman.

It would be useful to see how much damage output changes from character to character when adjusting talismen, same with damage resistance, etc.

I can see that "talisman x" has 500 more magic than "talisman y", but how much damage does that actually translate to?