Worldstone

The worldstone is a massive coalescence of magical energy that serves as a source for much, if not all, of the natural and wild magics unique to Terragard.

Unique magics include dwarven Rune magic, Elven song magic, soul magic and blood magic. These magics do work outside of Terragard but to a significantly lesser effect, and not without the direct support from a power magical entity. Even then, knowledge of these magic forms are sparse and rarely put to great use.

History
Little is known about the worldstone. One particular text claims that it was found deep under the WInterspines by the stonefist clan. They withdrew from dwarven society entirely and obsessed over its immense power. Stonefist Hold is a massive fortress that was built to protect the stone, a monumental feat of dwarven engineering only made possible by the signficant advances in magitech granted by the worldstone itself. Staffed with impenetrable stone guardians and Stonefist dwarves, the worldstone was held in one of the most secure and secret magical vaults ever conceived.

Somehow, years later - the worldstone was stolen by the forces of Ner'hor. It remains a mystery as to how they accomplished this, but the power they wielded was used to build an army of undead and starting the War of the Great Purge. The worldstone's power was brought to bear with such force that it was broken in the process and eventually the forces of good led a team of high-powered adventurers behind enemy lines to destroy it, marking the end of the war and the eventual ceasefire of Nerhor.

Normally holding the power of the worldstone would have made anyone godlike, able to even control the natural deities directly and bend them to your will. When the leaders of Nerhor found this not to be the case for them, they were enraged and decided instead to raise an army and to corrupt any powers that touched the worldstone - of which there were many. While the destruction of that army and the resulting war was vast and devastating, it did not grant them godlike powers - though few know exactly why.

Today
Pieces of the worldstone were scattered about the realm over time as the worldstone broke down under the strain of intense use. Some of these pieces are known as sunstones or nightstones, depending on their level of corruption. Smaller versions known as 'shards' are also commonly found and hold a small amount of latent magical power which can be used to enact small amgical miracles or to form together and become sunstones (or nightstones).