Lunar ore is an ore that can be mined from the Lunar rock by players with 60 Mining and up during the Lunar Diplomacy quest. It is mined at the stalagmites in the western part of the Lunar Isle mine.
It can be smelted into a lunar bar through the Smithing skill, granting 6.2 Smithing experience, and then made into a lunar helm or V sigil. The V sigil requires three lunar bars to make.
The lunar helm (along with the rest of lunar armour) can be kept inside of a player's house so they may make a second.