Chapter 410 is out! Natsu and Gray are kill!
This is followed by >>117285689
He'll properly slays every breathing demon with his presence alone. Afterwards he turns to a sudden jobber and is beaten by natsu. While he is immortal natsu is dying after the battle so as a "gift" for the "nice fight" Zeref transfers his immorality to Zeref and dies. End of manga.
So curses are born of negatives emotions and this curse is designed to make someone "vanish" as if he had never existed.
Next chapter, Natsu and Gray confirmed alive because of the feeling of friendship from their nakama and the many moments they spent together.
That would explain a few things.
That was Lucy's theory, at any rate.
Have some bullshit Tartaros stats from Volume 46. They're for an imaginary card game, so I'm not sure how accurate they're supposed to be.
Some have card effects that can raise their base stats, e.g. Kyouka can increase by 100 per turn.
Sayla can double her attack stat. Not sure how the spell costs work, since some of them are higher than the card's Curse power.
Trafzer can triple his defense stat for 3 turns.
And combined for easier comparing.