Pulse gun

[Vomitus]

So if it gets bonus, what penalty does it take in return?

Its penalty would be its price. Its price should be much higher than the weapon with dps similar to dps this weapon deals to 1 target(i.e. 100%).

The price of this weapon should be equal to a weapon with 30%-40% more dps. This means that this weapon will be equal to usual weapon when fighting 4 targets at once(for 30% case). And it will be weaker when fighting 3 or less targets. But it will be stronger when fighting 5 targets or more! That is the point.

Example:

Swarm Rockets
cost: 3300
range: 1000
dps: 220

Pulse Gun 1
cost: 3300
range: 1000
dps: 169 (2: 186, 3: 203, 4: 220, 5: 237, etc.)

Pulse Gun 2
cost: 4290
range: 1000
dps: 220 (2: 242, 3: 264, 4: 286, 5: 308, etc.)

'Standard Dummy Weapon'
cost: 4290
range: 1000
dps: 286


Note however that these weapons, like any other disregarding their price are totally equal when you fight 0 targets... ;-)