Engineer

Engineer is a playable character in Risk of Rain 2.

Unlocking
In order to unlock this survivor, you need to achieve the following challenge: Engineering Perfection.

Tips

 * Getting several and stacking TR12 Gauss Auto-Turrets on top of each other is a great way to cheese certain bosses. This isn't as effective on the Magma Worm as it tends to knock the Engineer out of the healing radius or outright destroy the turrets, but the Turrets' auto-aim may make this boss easier to fight nonetheless.
 * Getting plenty of AoE and/or proc items for your TR58 Carbonizer Turrets (like, , , , etc.) and some healing items for the early game (like ) will turn them into fairly self-sufficient powerhouses. If you manage to get the right items, both damage and defense wise, these turrets will pretty much clear stages by themselves!
 * A single can allow for 100% uptime of Bubble Shield.
 * Stacking can lead to a constant up time of your Bubble Shield, allowing for good cover from Wisps and Titans/Colossi as the game progresses. It also proves useful to refresh your Turrets' cooldown, giving you a backup in case one of them gets destroyed.
 * Both Pressure Mines and Spider Mines can be stuck onto the outside surface of the Bubble Shield. is highly useful for both mines.
 * Placing Spider Mines on elevated positions may allow them to jump onto airborne enemies. Similarly they can be placed onto NPCs and other survivors in a coop situation unlike the immobile Pressure Mines.
 * is a valuable item in the beginning levels that lets your Turrets heal as they deal damage. They're particularly useful on the more rapid firing TR58 Carbonizer Turrets.
 * An easy way to amass large amounts of healing on TR58 Carbonizer Turrets during mid-game or late-game is to stack for healing on crit and +5% crit chance,  for attack speed buffs on crit and another +5% crit chance, and at least 9   for +90% crit chance. This combination of items results in guaranteed crits as well as healing from every instance of damage dealt that increases with the amount of  the turrets have.
 * Due to their faster firing speed, TR58 Carbonizer Turrets are better at proccing certain item such as, , , and . and  may improve them further (though these are universally good on both turrets).
 * Due to the AI behavior of TR58 Carbonizer Turret, might be useful when they eventually haphazardly charge into enemies. A  and a few  or  can allow them to turn this caveat into a positive.
 * You may sprint while Bouncing Grenades is charging up. Deploying Bubble Shield will not stop sprinting.
 * Acquiring, , and as many as possible will allow the stationary TR12 Gauss Auto-Turret to spawn many of the flaming skull projectiles as you and both your turrets will all heal each other (causing N'Kuhana's Opinion to continuously proc).
 * TR12 Gauss Auto-Turret and the TR58 Carbonizer Turret will not receive new items their Engineer picks up after deployment. Their items are only updated upon redeployment.
 * Both turrets greatly benefit from as the 3 second invincibility time will always reset on newly deployed turrets as long as the Dio's Best Friend has not been used up on the Engineer himself. This is an especially important item during Monsoon runs.
 * can be used to offset the long cooldown of the turrets, though TR58 Carbonizer Turrets can pick the ammo packs up by walking atop them. This may not be a problem if you and your turrets have.
 * The TR58 Carbonizer Turret still benefit from attack speed even though they shoot lasers, i.e. 1 makes them go from 2-3 hits per second to 4-5.
 * TR12 Gauss Auto-Turrets can be used to press the buttons on Abandoned Aqueduct

Trivia

 * Engineer was one of the playable characters in the first Risk of Rain.