The potions of Refreshing Elixir never show during a battle. The description is that they "refresh the moves" however, during the battle no units has the potion available to be used.
The "break" skill is supposed to be a normal attack and also destroy defences for a number of rounds.
It appears it does nothing. No damage done and nothing to suggest the enemy unit is easier to damage afterwards.
I am still enjoying Beta 5 a lot however, there appears to be a host of issues that still need resolving. I am hoping we see an update real soon. A Beta 5a?