Fossils

Fossils are used to craft attack boosters, a Crucible and a Transmuter; they are also used to make level-400 items.

Fossil-gathering quests run in the Iron Caves. They drop from one mob type; the loot is called Ore. It is a chest with any fossil of your choice; the amount of Ore is 2, but a Horn of Plenty raises it to 6; the drop chance depends on the "Mining" profession level and is 40% to 70%. Horn of Plenty does not change the drop chance;

Gathering fossils also trains the matching profession, based on the price of the fossils you get.