Stop me if you've heard this one before here.
Just as the name implies, bombs which range and graphical placement would only be viewable to the party, and disregarded by enemies that casually avoid these (much like gremlins and PVP), inspired by mines placed in OCH.
I had thought starting them from the 2* blast bomb; weaker than the Deconstructor family, these do not cause either knockback or knockdown, only stagger. The bomb compensates this for both the linger and charge time the player is able to obtain via regular means.