Lavaland Anti-Megafauna Shield Projector Thing(TM)

[Sniblet]

Something to prevent this

from ever happening by accident again, because it ruins rounds with consistency and efficiency that no other single honest(?) mistake by any other job can pull off
Just like put a machine in some closet that keeps megafauna away, and don't spawn megafauna inside its radius at roundstart/force them out in real-time (probably necessary since like half of them have some kind of teleport)
Have it sap a chunk of stamina from miners who cross its barrier to prevent it being abused in combat with megafauna, it'll probably need a bit more discouragement than that though like stopping ranged attacks coming out of it (abuseable in PvP? is that a bad thing?)
Obviously make it destructible and toggleable on/off, have that trip an admin alarm, make activation and deactivation a gradual thing so it can't be flickered because that's annoying for admins and someone will find a way to abuse it in a boss fight