Javelin/ME3SP

Description
Called the Javelin by Alliance marines, this geth weapon holds a reservoir of ferrofluid, magnetically drawn into the firing chamber and expelled at lethal speeds. Like a high-pressure water-jet, the ferrofluid cuts through nearly anything it hits with so much heat that it resembles a beam of light, causing terrible wounds.

Acquisition
The Javelin is found during the mission Rannoch: Admiral Koris, on the path after a crashed escape pod. (It is also purchasable at Elkoss Combine Arsenal Supplies post-mission if it was missed.)

Player Notes

 * The Javelin allows you to shoot through thin materials without Armor-Piercing Ammo or the Piercing mod. As standard, it can fire through up to 1 metre of objects.
 * The Javelin's thermal scope will allow you to see through as much cover as it can pierce. This feature scales with weapon mods that increase its piercing ability.
 * There is a short charge time for the weapon before it fires, which could compromise moving shots. This 'lag time' between pull and shot can actually benefit the shooter if the target moves unexpectedly, allowing the user a split second to realign the shot before it goes off.
 * However, if the shot canceled while charging, Infiltrator's Tactical Cloak deactivates, because it will still register the shot.
 * Functionally it's very similar to the M-98 Widow, however the Javelin allows limited vision through smoke without the scope mod. The Javelin can detect a target and give it a purple outline while scoped in. It seems to be that targets will only be highlighted if their cover can be shot through, among other factors.
 * While zoomed, the Javelin can see cloaked enemies, giving them a purple outline, making it especially useful against Geth Hunters, and even more so in the Rannoch missions where Geth Hunters are plentiful. Similarly, cloaked Cerberus Phantoms can also be finished off, preventing them from regenerating while hidden.
 * Aiming slightly ahead of a target is advised with this weapon, as on harder difficulties, missing can leave you exposed, still under attack and bearing the brunt of a long reload time.
 * On higher difficulties, the Javelin can kill a Geth Pyro with one shot if the shot travels through the head then the fuel tank. It will strip the shields then set the tank on fire.
 * The base penetration and smoke vision of the Javelin make it an excellent weapon to take to missions against Cerberus as it will be able to see through the smoke and shoot through the shields that Cerberus enemies deploy.