If Diabride, Natural Pyroxenecrushes 2 of the opponent's Life Cloth and the opponent's Arc Aura's Life Burst is activated, both Diabride and Arc Aura will activate at the same time. In this case, the turn player's (the attacking player's) abilities resolve first - Diabride will up herself, and then put back down by Arc Aura's Life Burst.
To damage the opponent means to crush 1 of their Life Cloth, and if they have 0 Life Cloth when this happens, you win the game.
The second [Constant] ability of Diabride, Natural Pyroxene is triggered once per turn, and does not affect other Diabride. For example, if your opponent uses Don't Move and chooses two Diabride, both Diabride deal damage to the opponent (crushing a total of two times).[1]
If Diabride, Natural Pyroxene is on your field and is removed from the field by your opponent's ability (e.g., Gothic Boundary), Diabride's second [Constant] ability will activate and damage the opponent.[2]
If 2 different Diabride, Natural Pyroxene are on your field and are sent to your hand by your opponent's Rococo Boundary, and by 1 of your Diabride's second [Constant] ability your opponent's crushedLife Cloth reveals a SNATCHER that causes the discard of 1 of your Diabride now in hand, your opponent is still dealt the damage of the additional second [Constant] ability.
If Diabride, Natural Pyroxene is on your field and is affected by your opponent's Eternal Punish, and is then reduced to 0 power and banished, you do not damage the opponent by Diabride's second [Constant].
The position of Diabride, Natural Pyroxene when Diabride's second [Constant] ability being triggered (by being affected by Eternal Punish while on the field) now differs from its position of activation (banished to the Ener Zone).
If you use Dark Matter while Diabride, Natural Pyroxene is on your opponent's side of the field, Dark Matter will add a Life Cloth, then Diabride's second [Constant] will crush that same Life Cloth. If you have 0 Life Cloth at the time Dark Matter was used, you will not lose the game, as Dark Matter resolves before Diabride.[3]