User blog comment:Miskos3/Fairy Tail 514: Dragon Seed, Review/@comment-30338537-20161213161220

At least this finally explains the existence of Dragon Lacrima. Irene was already revealed to be very skilled at removing and attaching Magic to/from objects. She may have transferred the DS Magic of those who suffered from the side effects into several crystals.

Country of Dragnov and clan Dragneel, perhaps Zeref and Natsu hail from Dragnov as well and their parents were killed during the war. Maybe they even lived in Alvarez, as such they were among the first to fall victim to Dragons and Zeref later decided to return to his homeland to create an empire, while he left his brother with the Human-loving Dragons of Ishgar.

Now we also have an idea why Irene really wants Acno dead,as he is the main example of her "invention" going into the direction she absolutely didn't want and he may even be the one who killed Belserion.