Skip to content
The Iron Citadel — Onirism Walkthrough
Onirism

The Iron Citadel — Onirism Walkthrough

Your ultimate Onirism walkthrough for The Iron Citadel. Find all treasure chests, upgrades, and secrets with our step-by-step guide.

By ···10 min read·Multi-source verified
1 reading this guide  

Your ultimate Onirism walkthrough for The Iron Citadel. Find all treasure chests, upgrades, and secrets with our step-by-step guide.

Hey there! So you're diving into Onirism and looking to conquer The Iron Citadel? You've come to the right place. This area can be a bit tricky with all its hidden goodies and challenges, but don't worry, I'll walk you through it step-by-step. We'll make sure you find every treasure chest, grab all the essential upgrades, and overcome any tough spots. Let's get started!

Walkthrough:

This section of the guide focuses on helping you navigate The Iron Citadel and its associated areas, ensuring you don't miss any crucial items or upgrades. The source text provides a detailed breakdown of treasure chests and upgrades found in Chroma Falls, Inferno Valley, and Windy Meadows, which are likely connected to or areas you'll pass through to reach The Iron Citadel.

Chroma Falls Breakdown:

  • 0:00-0:28 Treasure Chest 1: Flaregun
  • 0:29-1:36 Upgrade 1: Battery Ammo
  • 1:37-3:37 Treasure Chest 2: 150 Pearls
  • 3:38-3:56 Treasure Chest 3: Pico Pico Axe
  • 3:57-5:03 Treasure Chest 4: 150 Pearls
  • 5:04-5:34 Dreamstone 1
  • 5:35-6:37 Treasure Chest 5: 150 Pearls
  • 6:38-6:55 Treasure Chest 6: 150 Pearls
  • 6:56-8:54 Treasure Chest 7: 150 Pearls
  • 8:55-9:45 Treasure Chest 8: Big Boomstick
  • 9:46-12:24 Treasure Chest 9: Bazooka
  • 12:25-12:56 Upgrade 2: Umbrella Charge
  • 12:57-15:56 Upgrade 3: Firework Ammo
  • 15:57-16:52 Emily's Brewery
  • 16:53-17:52 Treasure Chest 10: 150 Pearls
  • 17:53-19:15 Treasure Chest 11: 150 Pearls
  • 19:16-19:49 Emily & Upgrade 4: Super Grip
  • 19:50-21:44 Treasure Chest 12: 150 Pearls
  • 21:45-22:21 Key
  • 22:22-24:01 Treasure Chest 13: Frag Fruit
  • 24:02-25:01 Treasure Chest 14: 150 Pearls
  • 25:02-25:27 Treasure Chest 15: Dual Splashers
  • 25:28-26:03 Upgrade 5: Soapy Water Ammo
  • 26:04-28:08 Treasure Chest 16: Perfume Bomb
  • 28:09-28:38 Treasure Chest 17: 150 Pearls
  • 28:39-29:08 Treasure Chest 18 & 19: 150 Pearls and Scissors
  • 29:09-29:51 Treasure Chest 20: 100 Pearls
  • 29:52-31:11 Treasure Chest 21: Fairy Wand
  • 31:12-32:10 Upgrade 6: Extra Health
  • 32:11-32:59 Treasure Chest 22: P-Lah Mk3
  • 33:00-33:58 Upgrade 7: Foam Ammo
  • 33:59-35:13 Upgrade 8: Stamina Expansion
  • 35:14-35:30 Treasure Chest 23: 150 Pearls
  • 35:31-35:45 Upgrade 9: Energy Ammo
  • 35:46-36:15 Treasure Chest 24: 150 Pearls
  • 36:16-39:49 Inferno Valley

Inferno Valley Breakdown:

  • 0:00-1:23 Treasure Chest 25: Nade Launcher
  • 1:24-1:45 Upgrade 10: Extra Health
  • 1:46-2:18 Treasure Chest 26: Wispfire Perfume
  • 2:19-4:01 Treasure Chest 27: Aquommando
  • 4:02-4:50 Treasure Chest 28: 150 Pearls
  • 4:51-5:06 Treasure Chest 29: 150 Pearls
  • 5:07-9:16 Treasure Chest 30: Boomerang
  • 9:17-10:48 Laser & Axe Door Switch
  • 10:49-11:09 Treasure Chest 31: Sparkle Motar
  • 11:10-11:34 Treasure Chest 32: Firecracker
  • 11:35-12:12 Treasure Chest 33: 150 Pearls
  • 12:13-13:59 Upgrade 11: Soapy Water Ammo
  • 14:00-17:36 Agni & Upgrade 12: Charge Module
  • 17:37-17:51 Treasure Chest 34: 150 Pearls
  • 17:52-18:36 Upgrade 13: Stamina Expansion
  • 18:37-19:50 Axe Door: Pyrobarbarian
  • 19:51-20:32 Upgrade 14: Firework Ammo
  • 20:32-22:34 Upgrade 15: Battery Ammo
  • 22:35-24:47 Windy Meadows

Windy Meadows Breakdown:

  • 0:00-1:38 Treasure Chest 35: BB-12 Spreader
  • 1:39-3:14 Treasure Chest 36: P-Lah Mk3
  • 3:15-4:00 Treasure Chest 37: XPLM SonicBoom
  • 4:01-5:07 Treasure Chest 38: Rustic Boomstick
  • 5:08-5:37 Treasure Chest 39: 150 Pearls
  • 5:38-5:58 Treasure Chest 40: 150 Pearls
  • 5:59-6:31 Treasure Chest 41: 150 Pearls
  • 6:32-7:23 Upgrade 16: Energy Ammo
  • 7:24-7:42 Treasure Chest 42: Bubbler
  • 7:43-9:39 Power Switch 1 & Battle
  • 9:40-10:28 Upgrade 17: Firework
  • 10:29-13:18 Key 1
  • 13:19-13:59 Treasure Chest 43: 150 Pearls
  • 14:00-14:30 Upgrade 18: Foam Ammo
  • 14:31-15:10 Treasure Chest 44: 150 Pearls
  • 15:11-15:55 Treasure Chest 45: 150 Pearls
  • 15:56-19:05 Key 2
  • 19:06-22:25 Upgrade 19: Stamina Expansion
  • 22:26-23:07 Treasure Chest 46: 150 Pearls
  • 23:08-24:21 Treasure Chest 47: 150 Pearls
  • 24:22-26:19 Treasure Chest 48: 150 Pearls
  • 26:20-26:44 Upgrade 20: Extra Health
  • 26:45-30:55 Power Switch 2 & Battle
  • 30:56-34:05 Key 3
  • 34:06-34:42 Treasure Chest 49: 150 Pearls
  • 34:43-35:16 Key 4
  • 35:17-37:04 Treasure Chest 50: Sniper Rifle
  • 37:05-37:28 Treasure Chest 51: 150 Pearls
Tips
  • Keep an eye on your ammo and health. Some of these areas have tough fights, and you don't want to be caught short.
  • The treasure chests often contain valuable resources like Pearls, which are essential for upgrades. Don't skip them!
  • Pay attention to the upgrade timings. Grabbing the right upgrade at the right time can make a huge difference in combat and exploration.
  • The keys in Windy Meadows are crucial for progression, so make sure you locate all four.

100% Human-Written. AI Fact-Checked. Community Verified. Learn how AntMag verifies content