Path of Exile Fundamental fossil is a socketable currency item used to influence the crafting of equipment. Being socketed into resontors, it increases attribute mods rather than critical modifiers. This one of fossils drops in the first level in Azurite Mine and players can buy Fundamental fossils from Niko the Mad for 100 000 Azurite. The price for Fundamental in the game is a Chaos Orb. The easiest and cheapest way to get it, is to order the one from Gaming4ez.com.