Mother Boxes have some defined powers and other vague ones that show up generally as a 'save the day' kind of thing (although might end up resulting in the Mother Box's death as it sacrifices itself for its partner). You can also check the entry for Orion here at Classic Marvel to see one optional power, as his also helps him control his rage and demonstrates Emotional Control. From what I remember of an old Silver Age comic when Orion had been rendered into a coma and grown to giant size in space his mother box maintained a micro-environment close to his body to provide life support in space. An Elseworlds version formed into variation of Superman's S-shield as it helped free him from the control of Darkseid. They also protected anyone with one from the mind control of the Anti-Life equation (although being an Elseworlds that might not be what the Anti-Life equation does in the main DC, if there is one that is).
Their main purpose though seems to be linking one to the Source, opening Boom Tubes, and providing advise that only their chosen partner can hear, to everyone else it just sounds like they're pinging. As a Living Computer though it can substitute when one is in a position to require one, since the mother box can reconfigure itself for universal compatibility to plug into existing technology. The can also manage at least minor feats of molecular manipulation by restructuring clothing so one can go from costume to street clothes and back again with ease.
Since they are alive a hero should lose karma similar to killing any other living being though, although since they are known to make heroic sacrifices the penalties aren't as bad in those cases.
"A shared universe, like any fictional construct, hinges on suspension of disbelief. When continuity is tossed away, it tatters the construct. Undermines it."
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