Added

• Copper armor/tools (1.21.9+)
• Copper horse armor (1.21.9+)
• Nautilus armor (1.21.11)
• Oxidyzed lightning rods (1.21.9+)
• Copper chains, bars (1.21.9+)

Changed

• Chainmail armor now returns a full ingot (used to be a nugget before)
• Pack is multiversion 1.19-1.21.11 (older versions may work but log warnings about items introduced in 1.19-1.20)