SarfassaS (Reversed Sassafras) is a TESTBED Boss.
sarfassaS is a tan hexagon with 3 Builder turrets, and 3 Shotgun turrets. On the gaps outside the hexagon, there are 6 Manager barrels that shoot sassaminions. The turrets in the boss also have a eye. Eyes follow the player or where the boss is going.
Reversed Sassafras also has great firepower, but decent RoF. Make sure you have at least 3 bullet spammers to kill it.