Sending doesn’t have a range limit, and explicitly works across planes 95% of the time.

The big question here is what mechanically is them. Spells like Revivify target a dead creature, which means if the corpse isn’t the creature the spell won’t work. But there’s also no rule that dead creatures can’t talk or take actions or whatever, so you’d still be able to use Sending or just ask them normally. But that’s assuming they are a creature. The section on improvised weapons says that a dead goblin is an Object. If dying turns a Creature into an Object, then it could no longer take actions. But there’s also nothing saying that Creature and Object are mutually exclusive. maybe a corpse is both?

He asked someone to raise him up.

2013 was in 1988. 2020 was in 1990

Imagine this with no context.

Isn’t this just Mutants?

It’s the bottomless pit supervisor meme, but beyond that I’m stumped.