Ellician Diamond can be created only at the base of the Great Spire, in the Outlands.

This metal is an alloy between diamond and adamantite (stronger raw material form of adamantium), heavy on the diamond. There are possibly more ingredients, unknown of at this time. This alloy creates a substance that is incredibly sharp and incredibly difficult to bend. For this reason, no armor can be made of Ellician Diamond. This material is enchantable to quite a degree, and is valued by magical weaponmakers everywhere on the planes. One of the most popular enchantments for this weapon is for it to be given the properties of a dimensional blade -- a process this metal seems to take very easily. When imbued with a dimensional blade spell along with permanency, this metal takes on an interesting additional property - it will return to the casters hand when thrown, perfectly, every time.