Pretty much what the title says. Melts the player through 10 energy shields in notime, spawns at random and is pretty much invisible inside a ruined base. Or under the giant monster that spawns is. Players without combat gear get instakilled, players with combat gear have a second or two to get away or blow it up. Not very fun to play with - I was able to tank dozens of the smaller gleba walkers and some spitters and whatever they spawned, but then this turret came along and just offed me in 2 seconds - on its own.
I would suggest to either remove it, nerf the damage, or add a chargeup phase. Also possibly make it shine or something to make it visible, since it's THE most dangerous thing I've met so far, bosses included.