Talk:God Eater (Anime)/Episode 8: Sakuya Tachibana/@comment-26102810-20150925073623/@comment-26113680-20150926074138

Actually the game only mentions the basis for Aragami was discovered in 2050, and they developed really fast too fast. where they come from or how there is nothing. However they found traces of the Oracle Cells in layers of rock that were excavated from somewhere, that means they had been for quite some time already present.

As for their appearance... In a single year they eradicated a whole continent almost completely (America, that is from where the Ogretail, Cocoon Maiden and Zygote originate from) where are slowly other species emerged all around the world.

Initially each new strain was localised, but they spread somehow across the globe. Once again is it not explained.

However those spikes are something new. Maybe some extra lore to the GE franchise as it wasn't quite explained what made the huge holes in the field of "City of Mercy"