Sniper Monkey

Night Vision Goggles
This is a passive ability. Sniper Monkeys can now detect invisible enemies such as cloaked Shadowrath, but only within 2/3 of the Sniper Monkey’s maximum range. Costs 50 Gold and 100 Mana to research.

Full Metal Jacket
The bullets fired by the Sniper Monkey do increased damage and pierce through enemies for 5 seconds. Costs 85 Gold and 75 Mana to research. The damage done reduces by half of the previous damage per every consecutive collateral hit.

Strategy
A large amount of Sniper Monkeys with FMJ can be substitute for assassination units (due to the Monkey Empire's lack of them, possibly one of the only large drawbacks of the Monkey Empire). This can be done by making all of the Snipers aim at a single target (like a Magikill), activate FMJ and then the bullets will go right through whoever is guarding the target (for example, a wall of Speartons) and disintegrate the target.

Trivia
FMJ's damage reduction per consecutive collateral hits is a form of exponential decay; assuming that a Sniper did 100 damage, after it hits a first enemy the second enemy hit by that same projectile would take 50 damage, the third would take 25, the fourth would take 12.5, and so on.