It is a good thought
and would be helpful to some guys.
However as you say about glancing but instead of making a mode to be invincible can't someone do something like native multiplayer duel server where your both in the exact same low level gear and have the dueling weapon of your choice then.
As well as keeping the standard duel server as it is now for those that don't wish to do a training duel.
Just a thought if i explained my thought right
