Iron Treasure Chests can be found on the Lava layer underground and shallow caves that will lead into this layer, where they will spawn randomly at any time of (ingame-)days as soon as player-characters come into range of view (no direct line of sight needed though) on Hardened Lava or Igneous Rock, more rarely on Nodes or other natural blocks.
Like all other Treasure Chests these chests can only spawn on solid natural blocks in darkness, but will stay where they are when you place torches next to them or when the sun hits them after they have already appeared.
You cannot put anything inside these special chests, and if you take "everything", you will not receive any chests or the like, but only the contents of the chest, while the chest will vanish.
Unlooted Treasure Chests will disappear if all player-characters wander off too far. Half-looted chests will prevail a little longer so you can teleport home and return within a short while, but will be gone if you do not return for a longer time or if all player-characters log out.
Iron Treasure Chests can - randomly - contain (as of R26 in December 2015):
- Notes and/or Data Chips
- Perfumes (Eau De Pigsy, Fantasia De Leafi, Arome Chizzard, L’Rockster)
- Pet Accessoires like Hats or Bows
- Obsidian Swords (rarely)
- pieces of Obsidian armor (rarely)
- Obsidian Mining Cells (rarely)
- Advanced Extractors (common)
- Coal Torches (common
- Brown Mushrooms (common)
- Iron Ore (common)
- Obsidian Ore (common)
- Explosive Bombs
- Stun Bombs
- Basic Extractors
- Red Wood Walls (common)