Glassteel

Theurglass, also called glassteel, is a transparent material that is both stronger and half as light as iron and lacks the normal greenish tint of glass. It is made with a complex metallurgical and alchemical process that also requires extensive knowledge of glassblowing, discovered by the sun elves and avariel. It is mostly used to build fantastic castles but also finds common use as a hull plating for Spelljammers. Some also use it to create weapons and armour, though for most, the cost of doing this is prohibitively expensive, especially when crafting armour.