@CitizenBane: You have me at disadvantage due to me not having read the Furies mini-series (because of my dislike for them), as my interpretation was relying solely on my perspective based on the events of Sandman, but that makes greater sense from the point of view of the Furies and their overall function in the grand scheme of things.
@CitizenBane: Technically, shouldn't the Kindly Ones first be asked to intervene? As far as them not going directly after Death for killing Dream is concerned (not that they would had succeeded even if they had, a threat from her made them scatter fast). Dream killing Orpheus would had not normally invoked a response from them had Lyta Hall not been involved in the affair. No argument about Death transcending any rules that potentially apply to the other Endless, though.
I fear a debate regarding Destiny's power over Lucifer would be a philosophical rather than a practical one, so I will leave it at that.
I don't think this is true. He is certainly important, but should he be destroyed existence wouldn't itself be threatened. Galactus on the other hand is important enough that his eating habits keep Abraxas in check.
Dream and the other members of the Endless are aspects of existence, they can't be destroyed because they'll exist as long as creation in general exists. That thing about Galactus having to keep Abraxas in check has been ignored in recent years; two alternate-universe Galactuses (Galacti?) were killed in the pages of Hickman's FF and there wasn't a whisper of Abraxas.
If you go by the Post-Crisis History of the DC Universe and assorted Vertigo comics both including and aside from the Sandman and Lucifer books, the Endless are multiversal beings. Galactus is usually universal at best.
Well, Lucifer certainly thinks that Dream can be killed, and Dream convinced the demons of Hell that they were better off if they didn't try to kill him, which would be an odd thing to say if he didn't think he could be destroyed.
Dream did get killed in The Kindly Ones storyarc, so I see no point for debate. He simply gets reborn as a different point of a view afterwards, as did the first Despair.
I don't think the ocean liner would do the trick here.
It most assuredly would and it is well within the abilities of current Iron Man to do such a thing (which is the armor Rhodey possesses at this moment). Current Steel as shown in Action Comics has a feat and a half (beating Metallo with a plot device) and nowhere near the raw firepower or physical attributes to compete. He doesn't even have a helmet. Rhodey could just head-shoot him.