Base Defense is a single/cooperative modification based on horde-style and RPG systems. It's awesome, you should try it ;)
New weapon reveal! This weapon holds the power of a rail gun but fits in one hand! It shoots through everything: walls, doors, boxes and of course monsters. New challenge: make your enemies run after you in line and just erase them with one trigger click.
This gorgeous model was made by Georg Destroy.
Animations are mine.
Nice!