The Lost Dragon Slayer

Natsu, in an attempt to save Lucy's life from an enemy wizard from an unknown dark guild, sacrifices himself to save her. Falling down into a dark abyss, she watches as Natsu's life comes to an end. How will they cope with his death, and the impending dangers that the Alvarez Empire are forming with the finding of their lost Prince? SPOILERS for recent FT chapters. END!Natsu, NaLu, END!NaLu, hints of GraLu