Starglass

This brittle, transparent substance is tempered by moonlight and starlight, using elvish rituals. Starglass blades are incredibly sharp and starglass plates are incredibly hard, but their true potential can be realized only by breaking them.

Starglass Weapon (Rare): When you succeed on a melee attack with a starglass weapon, you can double the mundane damage dealt by the attack. Immediately after this doubling, the starglass weapon shatters and is destroyed.

Starglass Armor (Rare): When you take mundane damage while you wear this armor, you can reduce that damage by 20 (provided that you weren't incapacitated before taking the damage). Immediately after this reduction, the starglass armor shatters and is destroyed.