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Once Human: Silo Sigma Nightmare Walkthrough Guide (Beginner)
Here's a guide on how to beat Silo Sigma on Nightmare difficulty. We'll cover locations, rewards, tips, hidden room strategies, and boss fight tactics in detail to help even newbies clear it easily.
1. 📍 Silo Sigma Location and Basic Info
- ✅ Silo Sigma is located at the 9 o'clock direction of Deadville
- ✅ The nearest warp tower is the Sigma Warp Tower
- ✅ Difficulty is divided into Normal, Hard, Master, and Nightmare, with different rewards for each difficulty
- ✅ The mutations change weekly, so it's important to choose weapons that match the mutations
00:08 - 00:32
1. 📍 Silo Sigma Location and Basic Info
- ✅ Silo Sigma is located at the 9 o'clock direction of Deadville
- ✅ The nearest warp tower is the Sigma Warp Tower
- ✅ Difficulty is divided into Normal, Hard, Master, and Nightmare, with different rewards for each difficulty
- ✅ The mutations change weekly, so it's important to choose weapons that match the mutations
00:33 - 00:43
2. 🎁 Silo Sigma Rewards and Start of Guide
- ✅ Main rewards: Armor Glove Module, Energy Link, Armor Module Parts, etc.
- ✅ Nightmare difficulty is recommended because the first reward on the weekly reset day is good
00:44 - 01:13
3. 👾 Rosetta Strategy and Elite Mob Handling Tactics
- ✅ Create bullets with the control unit obtained after defeating Rosetta to attack the Rosetta spawn area
- ✅ Defeat 3 elite mobs, then clear the remaining mobs
- ✅ Use Reverse Warfare if the elite mobs don't have piercing attacks
- ✅ Be careful as damage is reduced for mobs inside the fan shield
01:29 - 01:47
4. 🛡️ Second Area Strategy and Rosetta Bruiser Countermeasures
- ✅ Remove all mobs and turrets in the second area
- ✅ Attack the legs or head instead of the shield of the Rosetta Bruiser
- ✅ Obtain the hidden room entry key from the Bruiser
02:06 - 02:15
5. 📦 Trans Object Location Check
- ✅ Trans objects exist in the corner and the right room
- ✅ Checking the location of the trans objects is essential
02:23 - 02:41
6. 🪜 Stair Section and Watch Out for Snipers and Turrets
- ✅ Use frog jump impulse to climb the stairs in one go with a double jump
- ✅ Prioritize removing the sniper and turret on the left 2nd floor
- ✅ Be careful of the damage you take when attacking high-HP mobs
02:51 - 02:57
7. Monster Strategy
- ✅ Defeat Gruder and Isangmok in the same way as before
03:02 - 03:15
8. 🚪 Hidden Room Entry and Death Rabbit Acquisition Info
- ✅ Enter the hidden room only if you need Death Rabbit (time consuming)
- ✅ Refer to the link above for hidden room tips
03:18 - 03:48
9. 🎰 Hidden Room Wish Machine and Boss Strategy
- ✅ Start the Wish Machine and fill the gauge to 100 (boss appears at 90)
- ✅ Be careful as the hidden room boss has no weaknesses
- ✅ Finish filling the Wish Machine gauge after defeating the boss
- ✅ Gas Rabbit can be obtained from the hidden room
04:06 - 04:17
10. 🐺 Preparing for the Final Sigma Boss Room
- ✅ It's difficult to clear without the Whisper of the Wolf infection
- ✅ It is recommended that one of the party members bring the Wolf
04:22 - 05:06
11. 🤖 Sigma Boss Fight Core Strategy
- ✅ When the boss's health is halved, remove the shield with a machine gun and then deal damage
- ✅ Create 2 turrets, destroy them, and then attack
- ✅ Frequent deaths without the wolf infection, utilize continuous damage (Flame, Frost, Vortex, Molotov)
- ✅ Shield can be quickly removed with a machine gun after Molotov damage
05:07 - 05:18
12. 🏆 Silo Sigma Clear Rewards
- ✅ Choose recommended weapons according to your preference
- ✅ Butterfly can be obtained when clearing the Sigma boss