Mithril enhancements – Heroes 3: ERA Project

Author: Liso1 October 23, 2026 0 Comments

Mithril is a rare magical metal that is stronger than steel, as light as aluminium, extremely durable, and valuable. It was introduced in Heroes 3.5: In the Wake of Gods.

Small amounts of mithril can be found on the adventure map or obtained from Windmills. You can use it to upgrade resource mines and creature dwellings, reveal what lies on the other side of a teleport, and much more.

To check your mithril reserves and see what you can use them for, right-click the Kingdom Overview icon (the castle button on the right, below the adventure map). To spend mithril on an upgrade, right-click the corresponding building.

NOTE: For Mithril to appear in the game, you must have the “Mithril Enhancements” script enabled; you can find it in the WoG Options, under the “Map Enhancements and Artifacts” section.

Mithril Enhancements

• Upgrade Wood and Ore Mines
  • Doubles wood or ore production for one week.
  • Cost: 4 mithril.
• Upgrade Crystal, Gem, Sulfur, and Mercury Mines
  • Doubles production for one week.
  • Cost: 3 mithril.
• Upgrade Gold Mines
  • Doubles production for one week.
  • Cost: 7 mithril.
• Upgrade Windmills
  • Doubles production.
  • Cost: 5 mithril.
• Upgrade Creature Dwellings
  • Cost: varies depending on the dwelling.
• Create a Magical Protective Field
  • Protects the castle with a magical surface.
  • Cost: 1 or 2 mithril.
• Build a Lighthouse Near a Shipyard
  • Cost: 3 mithril.
• Change the Spell Offered by a Magic Shrine
  • Cost: varies depending on the shrine.

• Change the Skill Offered by a Witch’s Hut
  • Cost: 2 mithril.
• Reveal What Lies on the Other Side of a Teleport
  • Cost: 1 mithril.
• Protect Mines from Changing Their Resource Type
  • If the option Mines change their resource type every week is enabled, you can spend mithril to prevent mines from changing their resource type.
    • Wood and Ore Mines: 1 mithril.
    • Gem, Crystal, Mercury, and Sulfur Mines: 3 mithril.
    • Gold Mines: 5 mithril.
• Increase a Town’s Income
  • Increases the town’s income by 1,000 gold per day.
  • Cost: 2 mithril + 7,000 gold.
  • NOTE: It works only if the “Castle Upgrading” script, found in the “Map Enhancements and Artifacts” section,is enabled in the WoG Options.