Wandering Vagrant

Field Notes
Day 3. While looking though some wreckage of the old ship. I felt hot sensation all over my skin and a brilliant white flash. Over the horizon maybe 5 miles north I saw it, looming over the forest tops.

It must have been the size of a house, this thing. A massive variant of the jellyfish seen earlier; this behemoth hovers in the air, searching for something. The gas used to propel this beast bend the trees below it flat. When it spotted its prey, it sent out six bioluminescent orbs, all crashing towards the ground and incinerating the target.

This Vagrant, as I've come to call it, seems to wander amidst the skies, followed by many jellyfish. On occasion the clouds part, I swear I sometimes see hundreds of vagrants up there. What are they looking for?