Superluminary book 2. Spoilers ahead
Like, Aeneas's jump lands him in another system, filled with undead instead of the living -- unmoving for the want of life energy. Lady Luna and Lord Pluto help him, but there are complications on the return. Like, where they need to land.
Return is worse, because the worlds he faced were not roused by him. His grandfather had prepared for the danger and drastic measures are needed. It involves who is emperor, a black hole, a Dyson sphere, what sunlight can do to vampires under what circumstances, the Ultimate Overlord, the effect of gas in space on an attack, and more.