The Shadow Agent is a promotional unit available March 13 to 18, 2014, for 80. It boasts a relatively high dodge, and has a great variety of attacks.
The Shadow Agents first attack, Rappel, is a "backstab"-type and thus attacks from the rear of the battlefield dealing a fair amount of -type damage to a single target with a high critical chance versus Critters and Soldiers.
Its second attack, Laser Shot, is a straightforward pistol attack with 40% Armor Piercing and direct line-of-fire.
The third attack, Heat Seekers, is an indirect checker strike attack, dealing moderate damage to potentially 7 enemies.
The Shadow Agent also unlocks a useful attack at Rank 4, Laser Stun Shot, with a high critical rate against Vehicles, 65% Armor Piercing and a 100% chance to the target. This attack can be researched for 25.
Offsets of this unit are its low , inability to target Air Units, and its attacks are not great against most armored units.