Shield breaker only affects Gun damage so it has nothing to do with the other melee elements. If a monster absorbs gun damage then shield breaker will null the absorption and you'll be able to deal damage to the monsters, although the damage done to them isn't as high as it would normally deal to a monster that has been broken.
As for resistance like the boss resistance, they still apply but shield breaker makes it so it's much easier to kill them even with the hp bar at red for the bosses.
It's important to remember shield breaker don't actually decrease any stats so the enemy's HV will still affect how much your gun will still do to them.
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Last edited by Zelkyri; 10-21-2009 at 04:18 PM.