Spiked pits should sometimes have spikes made of other materials besides iron, such as silver (to affect silver haters), glass (for higher damage), and copper.

Glass objects should be eligible for forging, since the temperatures involved in a forge are more than enough to melt and recast glass.

Also, it should be possible to forge pieces of worthless glass together to make decorative ornaments, which are worth either score or can be sold for spare money.

Wielded wood and plastic weapons (and possibly glass) block passive shock attacks, since they are non-conductive. Plastic could block 100% of the time and other materials less so, mainly to give a fringe benefit to a material that’s normally pretty underpowered.

The passive attack only gets blocked if you actually used the weapon to make your attack: if you’re polymorphed into something with a weapon attack and a bite attack, for instance, the bite will still subject you to the passive shock.

Using a weapon made of glass to force a lock should always end up with the weapon breaking.

It’s harder to force the lock on chests or large boxes made of metal, and increases the chance your weapon breaks. Additionally, the material of the weapon used to force the lock affects the result, if it’s used to pry rather than bash:

• Iron and metal behave as normal.
• Mithril is stronger than iron, and breaks less.
• Copper is slightly weaker than iron, and breaks a little more often.
• Softer metals, such as silver and gold, break less often but tend to bend. A “bent” weapon doesn’t actually become bent internally; it just loses a lot of enchantment.
• Wood is about as good as copper.
• Glass almost always breaks, and can break even if used to bash open a lock.

Jars, which are like tins except made of glass (or possibly, tins made of glass material, in object materials implementing variants). Generate quite often as chest contents. Possibly, what is in the jar is apparent just by looking at it.