A spoiler about Lucarion when Thei was a baby
Spoiler!
Lucarion was really the dragon who wiped out Trevaga in the previous timeline. Sadly, when the Spirits will soon turn to mana stone, they go on a rampage-they go mad. So by the time Trevaga was attacked, Lucarion lost his self already and regained his mind when he saw baby Astier and to save her, her opened a dimension rift which Tessetan managed to tag along.
I like to post spoilers for the stories I find interesting because I don't have much time to read novel due to busy schedule
you will find me in most romantic historical manhwa comment sections 
you will find me in most romantic historical manhwa comment sections 