In 3059, with the advent of new Clan weapon systems, saKhan Carns ordered the Nova Cat technician caste to begin an upgrade and refit program for their oldest second-line BattleMechs. With their Khan's approval, the Nova Cat technicians contacted their Diamond Shark counterparts - an arrangement that had occured before - to see if they would be interested in a joint venture. They agreed, and secretly went to work upgrading two older IIC designs. This venture would see further advancements as well, when the Diamond Sharks took the idea to a whole new level with the refitted and upgraded Warhammer IIC. Both were completed in February 3060, two months before they would be put to the test.

The Shadowhawk IIC 4 uses the Advanced Tactical Missile System backed by extended range and pulse medium lasers. The new design incorporates a new profile in the armor layout, giving the 'Mech a completely new look.

Armament:
1 Advanced Tactical Missile Systems
2 Medium Pulse Lasers
1 ER Medium Lasers