Engineer (LWR)

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 Engineer

The Engineer is specialized in supporting mechanical units and the use of grenades, with their starting Mechanic ability giving them 2 uses of Repair and corrosion removal.

Primary Weapons: Assault Rifles, Battle Rifles, Carbines, SMGs, Shotguns, Arc Weapons.

Secondary Weapon: Pistols, Autopistols, Sawed-off Shotguns.

Class-Limited items: None.

Attribute Growth: HP x2, Mob x2.

Abilities

Rank	Ability
Specialist	Mechanic Mechanic Grants 2 uses of Repair [Heal a mechanical unit for 5 HP and remove corrosion]. Removes corrosion from all adjacent allies after each action. When in partial cover adjacent to a SHIV: Gain Low Profile [Partial cover grants the defense and DR of full cover] and when that SHIV takes damage heal the SHIV for 25% of the damage taken (heal only occurs if engineer is idle, steadied, or on overwatch). Repair Repair Heal a mechanical unit for 5 HP and remove corrosion.
Lance Corporal	Double Tap Double Tap Shooting allows this unit to fire an extra shot if not out of ammo or targets. The extra shot gains +20 aim/crit if it's the same target. 1 turn cooldown after 2nd shot is used.		Grenadier Grenadier Using a destructive grenade deals +1 damage and costs only 1 AP. Equipped destructive grenades and MEC launchers receive an additional use and have no weight.		Smoke and Mirrors Smoke and Mirrors Using a support grenade costs only 1 AP and does not trigger reaction shots. Equipped support grenades receive an additional use.
Corporal	Holo Rounds Holo Rounds Firing at a target holos them for 3 turns [Prevents stealth, incoming shots gain +10 aim and +10 penetration].		Sapper Sapper Explosives deal +1 damage, gain +20 penetration, and double environmental damage.		Firebase Firebase While in partial cover adjacent to a SHIV: Gain +30% throw range, +1 damage to all weapons and equipment, and an automatic Steady Weapon if idle at the end of the turn.
Sergeant	Critical System Targeting Critical System Targeting Shots against autopsied mechanical units deal +20% damage and gain +20 penetration (+50% damage and +50 penetration if steadied). Does not work with Arc Weapons.		Tandem Warheads Tandem Warheads Explosives employed by this soldier do full damage at the extent of their area of effect (instead of 50%).		Dense Smoke Dense Smoke Smoke grenades grant an additional +20 defense (+50 defense total -- defense affects psi as well). Using a smoke grenade costs 0 AP.
Tech Sergeant	Master Mechanic Master Mechanic Increases the healing of repair by +4 HP and grants an additional use. Explosive shots that hit friendly SHIVs do not damage this soldier. When in partial cover adjacent to a SHIV: Both this unit and the SHIV gain 20% DR.
Gunnery Sergeant	Bring 'Em On Bring 'Em On This unit gains +0.5 damage on standard shots and incoming non-psionic attacks have a +5% graze chance for each enemy in sight.		HEAT Warheads HEAT Warheads Explosives gain +40 penetration and apply 50% more shred.		Acid Tech Acid Tech Acid grenades/spit damage armor on impact equal to 25% of armor HP (max 5, bypasses DR). Shots gain a 35% chance (100% if steadied) to apply corrosion.
Master Sergeant	Lock n' Load Lock n' Load Reloading any weapon costs only 1 AP and dashing automatically reloads the active weapon.			Extra Conditioning Extra Conditioning Grants +2 armor HP and +0.6 mobility, and a 10% chance for all end-in-idle actions to cost 0 AP.

Tactical Advice

Role: Offensive Support / Defensive Support

Engineers are a class largely based around items and special abilities, with their specialty being supporting and repairing mechanical units on the field. Additionally, they possess the ability to remove Thinman/Chryssalid corrosion debuff by moving to or performing actions next to affected units. Naturally, with perks such as Dense Smoke and Smoke and Mirrors, Engineers are extremely proficient defensive supporters.

On offensive front, they can support the squad using Holo Rounds giving whole team aim bonuses. Furthermore, rare Acid Tech perk is both offensive and defensive tool that works on both bio and mech aliens. On its own Engineers can be built into mech counter as several of their perks are targeting mechanical units through increased accuracy or damage. Alternatively, Grenadier route offers strong AOE damage capabilities, but once spent, Engineer will have little to offer on offensive front.

As Engineers are mostly brought along for their consumable items, and therefore don't need high aim, they are great candidates to be your primary Psionic troopers or Officers.

Sample Builds

Support Engineer

This build eschews most of the Engineer's offensive potential for a dedicated support specialist. It focuses on the use of reaction immune support grenades such as Smoke, Concussion, or Acid grenades thanks to Smoke and Mirrors. Dense Smoke is a significant upgrade to Smoke Grenades, providing 60 total defense to physical and psionic attacks as well as critical hit immunity. Holo Rounds enhances your squad's ability to focus fire on important targets. Mechanic cleanses corrosion, and repairs SHIVs and mechs. Overall this is a very specialized build that has no offensive power of its own but provides a reliable suite of utility that will help keep a squad safe in dire situations. Even more support options can be achieved through either Officer or Psi training for more utility.

Smoke and Mirrors Smoke and Mirrors

Holo Rounds Holo Rounds Firebase Firebase

Dense Smoke Dense Smoke

Master Mechanic Master Mechanic

Acid Tech Acid Tech

Extra Conditioning Extra Conditioning

Recommended Weapons: SMGs, Carbines, Arc Rifle
Recommended Equipment: Support Grenades, Survivability-increasers

Notes:

• As with other support and grenadier builds, this build is a good candidate for officer training to provide additional support when support grenades are expended, unusuable, or not worth using. Psi training unlocks Psi Grenades/Psi Frayer as options, but Engineers do not gain any multipliers for their will growth and will be difficult to train.
• Engineers and SHIVs/MECs work very well with each other thanks to Mechanic. This build has very little shooting responsibilities, and is uniquely capable of babysitting your mechs.

Grenadier Engineer

The Grenadier Engineer excels in putting out pinpoint explosive firepower. This build sacrifices support versatility or fire support to improve the effectiveness of the Engineer's explosives. Grenadier is when this build comes online, giving the Engineer extra grenades and the ability to throw them further. Firebase or Sapper combined with Tandem Warheads and HEAT Warheads improve the effectiveness of explosives significantly and ensure they remain competitive against the ever increasing alien threat. This build is very reliant on equipped grenades, and once they run out it is left with very few options except repairing friendly Mechs. Psi powers are a good option to keep the Engineer busy even when out of explosives.

Grenadier Grenadier

Sapper Sapper Firebase Firebase

Tandem Warheads Tandem Warheads

Master Mechanic Master Mechanic

HEAT Warheads HEAT Warheads

Extra Conditioning Extra Conditioning

Recommended Weapons: SMGs, Carbines, Arc Rifle
Recommended Equipment: Explosives, Survivability-increasers

Notes:

• The choice between Sapper and Firebase is mostly one of flexibility; Sapper grants more damage (including to the environment) than Firebase, while Firebase increases throw range and utility.
• As with many other supports and grenadiers, this build is a good candidate for Psi training to give them something to do when grenades are expended, unusable, or not worth using.

Double Tap Engineer

The DT Engineer focuses on building an effective shooter that doesn't rely on consumables as the other Engineer builds do. With an early penetration/accuracy boost from Double Tap and Holo Rounds, the DT Engineer can either setup in a defensive position and output reliable high damage or choose to move aggressively to deliver two flanking shots to an unwary alien. Critical System Targeting and a potential Acid Tech means that this build tends to focus on handling Mechs. This build pairs well with a mechanical tank to hide behind as it can keep the Mech in good condition thanks to the repair skill.

Double Tap Double Tap

Holo Rounds Holo Rounds Firebase Firebase

Critical System Targeting Critical System Targeting

Master Mechanic Master Mechanic

Bring 'Em On Bring 'Em On

Lock n' Load Lock n' Load Extra Conditioning Extra Conditioning

Recommended Weapons: Assault Rifles, Battle Rifles
Recommended Equipment: Aim-increasers, Ammo-increasers, Damage-increasers, Survivability-increasers

Notes:

• On close quarters maps this build can choose to use a shotgun, playing similarly to an Assault that specializes in killing mechs. This is quite risky, however, as they have no added defenses to keep them safe.
• At CPL, Holo Rounds gives +10 aim and +10 pen to your second DT shot (more with holo sync), while Firebase provides +1 damage to every shot with a steady bonus.
• At MSGT you get the choice between LnL for more ammo sustainability or Extra Conditioning to improve the overall survivability.
• None of the soldier upgrade paths are particularly strong for this build, thus any choice is fine for their general benefits to offense and/or defense.

See also

Long War Rebalance: Soldiers
Soldiers	Soldiers Assault Infantry Rocketeer Gunner Sniper Scout Medic Engineer
MEC	MEC Troopers Marauder Goliath Jaeger Shogun
Sub-classes and abilities	Officers Psionics Gene Mods S.H.I.V.s