Re: New Arc Fairy tail
1st. It's Romeo, Macao's son.
2nd. The narrator says no survivors were found, no bodies were found. In 99% cases, that means something. Figure it out.
3d. From Fairy Tail Wikia:
Makarov says, that on Tenrou, excluding other wild animals, live real fairies.
The Great Tenrou Tree bestows divine protection upon those bearing the Fairy Tail crest making so they can not die while it still has power.
4th. There are 3 great magics belonging to Fairy Tail. Fairy Law and Fairy Glitter. Maybe that mysterious girl/fairy/Mavis Vermillion used that 3d spell.