Mechanicus: Beginner's Guide & Best Tips

This Game Almost Broke Me

I bought Mechanicus on a whim during a Steam sale, expecting a chill tactical romp through some creepy tombs. Three hours later, I was staring at a loading screen after my fourth squad wipe, genuinely angry at a video game for the first time in years. I remember thinking, "This is unfair. The game is lying to me about its numbers. I hate this." Then I actually learned how the game works, and now I've got 400 hours in it. Let me save you that rage-quit moment.

This isn't a hard game once you stop fighting against its systems. The problem is that Mechanicus is phenomenally bad at explaining itself. The tutorial tells you how to move and shoot, but it never tells you why your carefully-planned attack just evaporated into nothing because a Skitarii got one-tapped from across the map. I'm here to fill in those gaps.

Why Most People Quit Before the Fun Starts

Let's be real about the pain points, because I almost bailed on this game twice.

First pain point: The cover system is a trap. You look at the battlefield, you see chest-high walls, you think "XCOM rules apply." They don't. The +2 Defense from light cover might as well be a wet paper bag against a Necron Gauss Flayer. I spent my first five missions watching my dudes die behind "cover" because I didn't understand that Mechanicus uses a dice-pool system, not a percentage hit-chance like XCOM. One shot from a Gauss Flayer rolls 5 dice. Each die hits on a 3+. Your cover subtracts 2 dice from that pool, not 2 from the hit chance. So that "35%" enemy shot is actually rolling 5 dice at 66% each. Cover barely helps against volume of fire.

Second pain point: The Cog system is overwhelming. You get these glowing ability points every level and the game throws a tech tree at you that looks like a spreadsheet from hell. I spent my first 10 hours hoarding Cogs because I was terrified of wasting them. That's a mistake. Cogs are the only resource that doesn't cap out, and you can get up to 3 per mission if you play aggressively. Hoarding them is like bringing a cup to a firehose.

Third pain point: The early game is brutally punishing in a way that feels random. Reanimations. You kill a Necron warrior, and three turns later it stands back up with full HP. I remember a mission where I killed the same damn warrior four times before I realized I needed to either destroy it in one turn or use a specific weapon type to stop the reanimation. The game does not explain this clearly. It tells you "some weapons prevent reanimation" but doesn't highlight which ones or why it matters so much in the first few hours.

If you've hit any of these walls, you're not bad at the game. The game just didn't tell you the rules. Let me walk you through it.

Your First Real Day on Mars

Forget everything the tutorial told you. Here's what you actually need to do in your first five missions.

1. Your starting squad should be: Tech-Priest Dominus, 2 Skitarii Vanguard, 1 Skitarii Ranger. The Dominus is your only heal and your only reliable way to remove debuffs. Keep him alive at all costs. The Vanguard are your front line — they have Radium Carbines that stack a +1 damage per stack debuff on enemies, and that stacks up to 5. Two Vanguard focusing the same target will kill most things in two volleys. The Ranger is your sniper. Put him on high ground and forget about him until something important needs to die from across the map.

2. Rush the "Taser Goad" upgrade for your Dominus. I know the fancy plasma cannon looks tempting. Ignore it. The Taser Goad costs 2 Cogs and gives you a melee attack that stuns the target for 1 turn. Stun is the single most powerful effect in the early game. It stops a Necron from reanimating for that turn, it stops a wounded enemy from running away, and it gives you a free hit. I've won missions I had no business winning because I stunned the only enemy that could reach my Ranger.

3. Always move your squad together. This is not XCOM. You don't "scout ahead" with one guy. If you activate a group of Necrons with a single Skitarii, that Skitarii will eat 4-5 overwatch shots before anyone else gets a turn. Move as a clump, activate as a clump. The activation range in this game is roughly 8 tiles from any unit. Keep your squad within that bubble and you'll never get caught with your pants down.

4. Buy the "Protector" Cognis weapon for your Dominus early. It's the one that shoots a single target for 3 damage with no ammo cost. It's not flashy, but it's your main way to chip down enemies that are about to reanimate. You'll thank me when a Necron with 1 HP left gets back up and kills your Vanguard.

5. Save-scum your first three missions. I'm not joking. The game's RNG is brutal until you understand the map layouts. Reload, try a different approach, learn which corridors are death traps. The central corridor on the first tomb map? Complete killbox. Don't walk down it. Go around the side.

Once you've got that foundation, you can actually start playing the game instead of surviving it. Let's talk about how to not just survive, but dominate.

The Stuff No Tutorial Tells You

I'm going to assume you understand the basics now. Here's the advanced tech that separates a "I keep losing" player from a "I finished the game on Hard" player.

Weapon interactions you NEED to know:

• Arc weapons (Arc Rifle, Arc Maul) do bonus damage to machines but garbage damage to infantry. That Necron Lord? Use Arc. That basic warrior? Use your Radium Carbine. I spent two missions trying to Arc-whip basic warriors and wondering why it took 6 hits to kill one.
• Gauss Flayers (the Necron basic weapon) have a flat 40% chance to ignore armor on every hit. This is why your heavy armor tank sometimes just explodes. Don't let him tank. That's not his job. Your Skitarii are glass cannons — treat them that way.
• The "Transonic" weapon family (transonic blade, transonic cannon) deals damage that ignores reanimation protocols entirely. If you kill something with a transonic weapon, it cannot come back. This is worth building around. The Transonic Cannon is a late-game weapon that costs 6 Cogs and has a 2-turn cooldown, but it's worth every Cog for dealing with Necron Lords and Crypteks.

Movement is more important than damage. I know that sounds stupid in a tactical shooter, but hear me out. Every unit in Mechanicus has 3 action points per turn. Moving costs 1 AP per tile. Shooting costs 2 AP. Reloading costs 1 AP. That means if you move more than 1 tile, you can't shoot and reload in the same turn. But here's the secret: you don't have to shoot every turn. If you reposition your Vanguard to the other side of a pillar, you force the Necrons to waste their movement getting to you. Their AI is aggressive — they will walk right into your overwatch if you bait them. Place your Ranger on overwatch behind a corner. Walk your Vanguard into LoS. The Necron will move to shoot the Vanguard, the Ranger gets a free shot.

This mechanic is similar to Hades — check out our Hades guide for more on bait-and-punish rhythm, but in real-time.

Cognis weapons don't need ammo, but they have a heat mechanic. Every Cognis weapon builds heat per shot. If it overcharges, your unit takes 2 damage and the weapon is disabled for 2 turns. The heat bar is tiny — about 4 shots per bar. Pace yourself. The Dominus's Cognis weapon can fire 3 times before needing to cool down. Fire 2, reposition, fire the third when it matters.

The "Canticle of the Machine" is not optional. Every Tech-Priest has an active ability that costs 1 Cog to use. The Dominus's "Benediction of the Omnissiah" is a +2 to all stats for 2 turns for one ally. Use this on your Ranger before a big shot. I've had a Ranger with Benediction active hit 4 out of 4 dice on a Gauss Flayer shot at max range, which killed the Necron Overlord in one hit. It's that strong. Don't hoard Cogs for this. Use it on turn 2 of every boss fight.

The final tip: Learn to read the activation dots. Each enemy has a small dot next to their health bar. If it's solid, they're active. If it's hollow, they haven't activated yet. If it's pulsing, they're about to activate on their next turn. This is how you avoid pulling three groups at once. If you see a pulsing dot, don't advance. Let them come to you.

Mistakes That Cost Me Three Playthroughs

I have a graveyard of failed playthroughs. Let me walk you through the specific dumb things I did so you don't have to.

Mistake #1: Trying to be the hero with the Tech-Priest. The Dominus is not a frontline fighter. He's a support unit with a gun. He has 2 base armor and 12 HP. A single Necron warrior with a Gauss Flayer does 3-4 damage per hit. Two of them will kill your Dominus in one round. I lost my first serious run because I thought "he has a melee weapon, he must be a tank." No. He is a fragile support drone. Keep him behind the Vanguard.

Mistake #2: Ignoring the Relic system. Every mission has 1-3 Relics hidden in breakable containers or behind locked doors. These give permanent stat bonuses. I ignored them for my first 10 hours because I thought they were flavor items. They're not. The Relic of the First Forge gives your entire squad +1 to all dice rolls. That's a flat 16% increase to hit chance on every attack forever. Prioritize breaking every glowing container you see.

Mistake #3: Building for raw damage over utility. I saw the Plasma Caliver and thought "50 damage, that's the best weapon in the game." It has 3 ammo, 2-turn reload, and requires 2 Cogs. That gun killed two enemies and then sat useless for half the mission. Meanwhile, the Radium Arquebus (the Ranger's long-range option) has 8 ammo, 25 damage per hit, and a 1-turn reload. It out-damaged the Plasma Caliver over a full mission by about 40%, and it cost less Cogs. Don't chase the big number. Chase the sustained output.

Mistake #4: Not using Delay actions. You can delay a unit's turn by clicking the button next to their portrait. This moves them to the end of the turn order. Why would you ever do this? Because if you delay your Ranger, the Necrons will move, then your Ranger gets to act after they've spent their AP. You can shoot a Necron that just moved into the open, and they can't respond because they already used their turn. This sounds small, but it's the difference between "my Ranger gets shot at" and "my Ranger shoots for free." I use Delay on at least one unit every single combat.

Mistake #5: Fighting the Necron Lord in the first tomb. There's a side area in the first tomb map that has a Necron Lord with 45 HP and a Gauss Cannon that one-shots any Skitarii. I thought "oh, optional boss, I can take him." I couldn't. He killed my entire squad in 4 turns. That boss is not meant for early game. He has a 5-tile activation radius that catches you off guard. Just skip that room until you have at least a Transonic weapon and a full squad of rank 3+ characters. I mark that room on my mental map and walk around it until Mission 5.

Quick Answers to the Questions You're Googling at 2 AM

Q: How do I stop Necrons from reanimating?
A: Transonic weapons prevent it. Arc weapons do not. If you don't have Transonic, you need to kill the Necron in one turn (deal enough damage to reduce it from full to 0 without it getting a turn in between). If it gets a turn after being damaged but before dying, it will reanimate when killed. Also, if you leave a Necron with 1 HP for two turns, it automatically heals. Finish them off.

Q: What's the best weapon to rush?
A: The Radium Arquebus for your Ranger. It's 2 Cogs, 8 ammo, 25 damage per shot, and it has a +2 to hit at long range. It will carry you through the first half of the game. Second choice is the Transonic Blade for your Dominus — 3 Cogs, 30 damage, prevents reanimation, and has a 50% chance to stun on hit.

Q: How many Cogs should I save?
A: Don't save more than 4 Cogs at any time. If you have 4, spend 2 on an upgrade for your weakest character. Cogs are the game's way of letting you build power, and hoarding them is like having a gas can in a desert — useless. You get 1-3 per mission, so you'll always have enough for emergencies.

Q: Is there a way to heal during missions without the Dominus?
A: Not easily. The Dominus has the only heal ability until you unlock the Tech-Adept class, which has a Medicae station that heals 2 HP per turn for anyone standing on it. That's around mission 4-5. Before that, your only heal is the Dominus's ability, which costs 1 AP and has a 3-turn cooldown. Use it sparingly. If a Skitarii drops below 4 HP, retreat them. Don't try to heal-tank.

Q: What do I do against the Necron Destroyer?
A: The big floaty death machine with the heavy cannon. Focus it with your Ranger from max range. It has base armor 4, which reduces all incoming damage by 4. Use armor-piercing weapons: Arc Rifles ignore 2 armor, Transonic Cannon ignores all armor. If you don't have either, use two Vanguard with Radium Carbines to stack the +1 damage debuff. After 3 stacks of the debuff, your hits do +3 damage, which offsets the armor. Keep your squad spread out — its cannon has a 3-tile blast radius.

Q: How long is the campaign?
A: About 12 missions if you're efficient, closer to 20 if you explore everything. A full playthrough is 8-10 hours on normal. The game has replayability because different Cog choices lead to different final missions. I've done three runs and each one had a different final boss.

If you're coming from XCOM 2, check out our XCOM 2 beginner guide — some of the positioning lessons carry over, but the combat rhythm is completely different here.

That's everything I wish someone had told me before I rage-deleted my first save file. Mechanicus is a great game once you understand that it's not trying to be XCOM — it's its own weird, punishing, beautiful thing. Go kick some metal skeletons.