Was playing with a random group of Arks. It was our first AQ Forest run. We ran through, got some bursts, leveling up fast, but that pales in comparison to what followed. .
We got not one, not two, not three, but FOUR EXP DOGS! Back to back! Then right after those free 7 levels, we bursted again, and ran into Falz Angel.
I thought it was a bug, a mistake, but no... it was luck... it was legendary.