[insight by Sevoris on general at 12/8/2017 9:22:08 AM]: One last thought on interdimensional (transtemporal) operations and civilizations:
It is assumed for first: There exists a Multiverse, where ΔQ > 0 applies
It is assumed for second: It is possible to travel between individual universal entities in some manner, and achive the exchange of discrete information from one universe to another
it is assumed for third: Specific event points within a universe can be targeted, or Universes do not run "in synch" - Which is to say, one universe can exist near the big bang at the same "multiverse time" as another universe is approaching maximum entropy.
In consequence: Given that such a Multiverse expresses every possible information state in some manner, it is very much possible to target one universe to draw power from the big bangs big soup, and use another universe as an entropy sink - As every possible state is expressed in such a universe, there exists another universe where the causal branch made impossible by interference of another universe is possible, and thus no information is ultimately destroyed or interfered with.
However, this implies the existence of a limiting factor that I will henceforth call the "Metacausal Event Exception" - Which is to say, not only does ΔQ > 0 apply, there also applies Event NxUx ≠ NxUy in consequence of the former law, so that no universe may express the same information state. In consequence, for a universe where living off other universes is possible, there exists a universe where the same is, for one reason, impossible.
So you better hope the cosmic dice dealt you a favorable number. If not, you may curse the great ontology and contemplate your eventual decoherence, or hope Bulk ascension is a metacausal event in your universe.