Problems with Eidolon Teralyst spawning

[(PSN)firestar55623]

Okay, you might call me raging (Seeing as I had tried to do the full night survived only for one person to disconnect 5 minutes before night ended and cost me the whole achievement and a ton of sentinet cores, so I very much am annoyed on that.) but this is a bit worse.

The reason the person left was that out of a team of four looking through a good amount of this absolutely insanely big map, absolutely NONE of us had even found the Eidolon Teralyst.

Now personally, a boss battle shouldn't be known for being insanely hard to even locate, we had 10 of the lures and nothing. No signs of spawning, nothing.

Not sure if a bug or if we just sucked at searching.

(BTW before people ask, no, no one had the archwings)