The Lobotomiser (QMI build)

Recently, I've been playing match after match with my Gethfiltrator, sniping like crazy, when I realised the Shadow is the only other 'trator I've got, and that's specced for melee, so I thought I'd try another for a different sniper. Here it is.

Build link

Tactical Cloak: take damage, recharge, damage. I'll explain why later.

Tactical Scan: weapon damage, movement speed, damage. Since you're using this as a debuffer, the weapon damage and headshots is your choice so you can take out bosses with fewer shots. Damage over area because if you're taking over 26 seconds to kill your target, sniping is not for you, and considering you're a sniper you should have a good lookout to see targets without the scan required. EDIT: headshot evolution is broken, take movement speed instead.

Arc Grenade: damage. These are for emergencies. You're a sniper, so don't go charging into battle. Use them for if any enemies manage to close in, or if a cluster of enemies is within throwing range. Throw one to stun the group; headshots galore.

Quarian Defender: damage/capacity weapon damage, headshots, weapon damage. Rank 4 was mainly evolved for a bit of a recharge boost, and you get a small bonus to grenade damage as well. EDIT: rank 4 was changed to take weapon damage due to advice from u/PostCool

Fitness: durability to make him less squishy

Weapon: Black Widow with extended barrel and spare ammo

Gear: whatever you have that increases sniper damage the most

The idea is to just play as a sniper. Hold back and shoot things in the head. With mooks, just plug them until they die, and with bosses use a Tac Scan to debuff, then shoot.

The Tac Cloak evolutions and Black Widow were chosen because the BW has 3 shots to a magazine, whereas any other of the really powerful ones are bolt action. I've got the IV, and with this build my TC recharge speed is 5.13 seconds. What does this mean? Upon firing a shot and decloaking, you don't lose the damage bonus. It sticks around for a few seconds. So if you cloak then shoot 3 times relatively quickly, each shot will have the damage bonus, meaning you'll be putting out thousands of points of damage in ~2-3 seconds. The best part? With TC's quick recharge, by the time you've let off three shots, you can use it to reload cancel, meaning that you can rain down consistent shots that all have the damage bonus from cloaking. On Silver, I can take down a Scion in 3 shots, a Praetorian in 6, all without breaking a sweat. On long range maps such as Rio, Dagger and Hydra, the Collectors actually become fairly easy due to their enormous heads, making for piss easy headshots. All that is with the Gethfiltrator, who only has a 20% headshot bonus. This build provides a 45% headshot bonus against targets debuffed with TS.