If you’ve ever spent 45 minutes fighting through hordes of corrupted raiders in Doom the Dark Ages only to watch Thira get taken out by a stray fire arrow right as you reach her cell, you’re not alone. I’ve messed up the doom the dark ages rescue thira mission more times than I can count, from forgetting to bring enough healing supplies to triggering the enemy ambush too early before I cleared the side paths. This guide breaks down every step you need to follow to pull off the rescue smoothly, grab all the hidden loot, and unlock the rare companion perk you get for keeping Thira at full health through the entire mission.
Pre-Mission Prep for Doom the Dark Ages Rescue Thira Success
You don’t need max level gear or a fully upgraded character to beat this mission, but a little prep will cut your failure rate in half. Skip the plate armor loadout for this mission – you’ll be navigating narrow cave corridors and chasing down hostage takers, so the extra movement speed from leather or chainmail will save you more health than the extra defense ever could. I tried this mission once with full plate and a two-handed axe, and I didn’t make it to Thira’s cell in time to stop the first execution attempt, so trust me, speed beats raw defense here.
Carry at least 10 regular arrows and 5 shock arrows – shock arrows disable the raider mages that cast the protection shield around Thira’s cell, and regular arrows work for taking out the sentries on the ledges before they spot you. Throw in two fire resistance potions too, because the second chamber has fire traps that trigger when you step over loose stone tiles. If you’re playing a melee build, equip a one-handed sword and a shield instead of a two-handed weapon, so you can block attacks for Thira during the escort section. If you’re playing a mage build, equip the shock rune on your main spell, so you can disable the mages and elite raiders faster.
If you have the tracking perk unlocked, equip it before you start the mission. It will show you hidden loot caches and enemy positions through walls, which will help you avoid accidental ambushes. You don’t have to have this perk to beat the mission, but it makes the whole process a lot less stressful.
How to Clear the Outer Cave Without Triggering Early Ambush
The first part of the mission is the outer cave network, and most players mess up here by making too much noise or taking out a sentry that’s in view of another. Start by staying on the left side of the cave entrance when you spawn in. The right side has a tripwire that sets off a bell alerting all 12 raiders in the first chamber to your position, which will make the raiders in the inner chamber start hurting Thira before you even get there.
Take out the two sentries on the upper ledge first with silent headshots – they have the best vantage point, and if they spot you, they’ll throw fire bombs that block the path to the inner cave for 2 full minutes. Once those two are down, you can clear the remaining raiders in the first chamber one by one, sticking to the shadows so you don’t draw too much attention at once.
There are a few common mistakes that will make this section way harder than it needs to be:
- Don’t touch the glowing gold chest near the first campfire before you clear all enemies – it’s a trap that spawns three extra elite raiders with poison weapons
- Avoid stepping on the dark grey stone tiles scattered across the cave floor – they trigger spike traps that deal 70% of your health in damage if you don’t have resistance perks
- Don’t use any loud weapons like explosive arrows or two-handed hammers in this section – the noise will carry to the inner chamber and make the raiders start hurting Thira early, lowering your final reward
I made the mistake of opening that trap chest on my first run, and those elite raiders took me out before I could even get close to the inner cave door. If you do accidentally trigger an alert, your best bet is to fall back to the cave entrance and funnel enemies through the narrow opening there, so you don’t get surrounded.
Unlocking Thira’s Cell and Fending off the Guard Escort
Once you get past the outer cave, you’ll reach the inner chamber where Thira is locked in a cage hanging from the ceiling. First, don’t run straight to the cage. There are two mages hiding behind the stone pillars on either side of the room, and they’ll cast a freeze spell on you if you get within 10 feet of the cage without taking them out first. Use your shock arrows to take them out from a distance – one headshot with a shock arrow will take them down instantly, no need to waste extra ammo.
The doom the dark ages rescue thira mission is designed to reward careful play, not rushing, so take your time clearing the inner chamber before you touch any levers. Once the mages are down, hit the wooden lever on the right side of the room to lower the cage, not the one on the left – the left lever drops the cage into a pit of lava, instantly failing the mission. I’ve seen so many streamers mess this up because they don’t take two seconds to check which lever is marked with the white raven symbol, which is the correct one.
Once Thira is out of the cage, she’ll follow you, but she only has 50% of the health of a regular companion, so you need to stay in front of her to block incoming damage. The next wave is six raiders and one elite captain who has a shield that blocks all regular attacks. Use a heavy attack to break his shield, then follow up with three light attacks to take him down fast. Thira will heal you for 20% of your health once the wave is clear, so you don’t need to waste a potion here if you’re low on health.
Escorting Thira to Safety and Unlocking Hidden Rewards
The last part of the mission is escorting Thira out of the cave and to the nearby rebel camp, and this is where most players lose Thira to stray attacks. The path out has three ambush points, and each one has raiders hiding behind rocks waiting to jump out. Stick to the high ground on the right side of the path as you walk out – you’ll be able to see the ambushers before they jump out, and you can take them out with arrows before they get close to Thira.
The most common reason players fail the doom the dark ages rescue thira mission is that they rush the escort section and let Thira get swarmed by ambushers. Walk slowly, check every corner, and don’t be afraid to stop and clear enemies before moving forward. There’s no time limit for this section, so you don’t have to hurry.
There’s also a hidden loot cache behind the large boulder near the exit, it has a rare Thira’s bow that gives you 20% extra damage on shock arrows, which is one of the best ranged weapons in the early to mid game. Make sure you grab it before you leave the cave, because you can’t come back to this mission area once you complete it. If you keep Thira at 80% health or higher all the way to the rebel camp, you’ll unlock her as a permanent companion, and she has a unique perk that lets you heal 10% of your health every time you take out an elite enemy. That perk is a game changer for harder missions later on, so it’s worth taking the extra time to protect her instead of rushing through the escort section.
You don’t need to be a max level player with the best gear in the game to pull off the doom the dark ages rescue thira mission successfully. All it takes is a little prep, paying attention to your surroundings, and avoiding the common mistakes that trip up most players. I’ve used these steps to help dozens of my friends complete this mission on their first try, and I’m confident they’ll work for you too. Once you unlock Thira as a companion, you’ll wonder how you ever played the game without her, so don’t give up if you mess up a few times at first. If you have any extra tips for this mission that I missed, feel free to drop them in the comments below, I love hearing how other players approach this tricky rescue.
