I found this while searching around the second level, Blue Team. I found three of these hidden objects and I have no idea what they do. When you activate them, lights come out of them. But that’s it, don’t know what else to do.
Oh man that’s weird.
I like it though - it seems vaguely…alien in origin. Not Forerunner though.
Maybe there’s a certain amount in each campaign mission and they unlock something if you find enough. Either that or they might unlock something crazy later in the level like the Phantom/Pelican thing or the Party in that one level in Halo Reach.
Keep your eyes open!