Early in Shawn Levy’s new superhero trifle “Deadpool & Wolverine,” Deadpool (Ryan Reynolds) learned that his entire universe will, within the next few thousand years, unravel and disappear from the multiverse entirely. It seems that every universe has an “Anchor Being” that, upon their death, brings about the end of their entire timeline. Of course, if the birth and death of a single being causes an entire timeline to end, that’s not so much an “Anchor” as a “Harbinger of Doom.” (It’s best not to think too hard about the concept of Anchor Beings.