Magical power enters the material world following several well-known channels. The primary source is, of course, the sun. The moon, planets, and stars also exert their own magical influence.
However, magic also streams upward from below. Vocanoes and natural springs, as everyone knows, are locations of powerful magic. Items that have their origins in the earth often retain powerful magical properties, such as crystals and, of course, gold.
The Magical Properties of Gold
The obsessive attraction exerted by gold upon magical creatures is well-known, and of course, felt by humans as well to a certain degree.
Dragons are the most notorious hoarders of gold, jewels, and gems. The possession of these magically-potent items appears to be connected with the longetivity of those magical beasts.
Some have speculated that dragons consume the treasures as food, but this idea is contradicted by the fact that dragon hoards never seem to shrink, only grow. The well-attested observation of dragons swallowing piles of gold seems to be explained as the method by which the dragon carries the treasure back to its lair. Presumably the treasure is regurgitated bird-style into the dragon's hoard, although this has not been observed (by anyone who lived to tell of it) to this point....
The Hoard of the Goblin King
The lure of gold upon the subterrainean goblinoids is also well known, most legendarily in the case of the hoard of the goblin king. Goblins who lair amidst the piles of gold appear to grow large and strong, perhaps owing to the magical properties of the magic-charged gold itself. The gold also appears to be used in their mating practices, as the significant presence of gold in their breeding pens attests.
The Minotaur Lords of Bullhead City
The shifting labyrynths of Bullhead City are reported to be awash in gold. The multitude of aggressive and powerful minotaur who constantly struggle for dominance there, however, has precluded much investigation.
It has been noted, however, that minotaur encountered in the wilds can be distracted and/or diverted by the surrender of bags of gold. Examination of human victims of minotaur attacks indicates that the bullmen have no interest in humans as a food source, only as a source of wealth.
The Secrets of the Dwarven Mines
As everyone knows, the Dwarven Mines are rich in two items: gold and magic weapons. How the dwarves produce magic weapons has long been a mystery, as they show no aptitude for magical ability in any other sphere.
It is suspected that the dwarfs somehow harness great magical power from the gold (and other magic susbstances) as they harvest it from the rocks in their deep caverns. This magical over-exposure may account for madness that overcomes those few humans who attempt deep delves into the Dwarven Mines. The hearty natural anti-magical resistance of the Dwarfs seem to shield them from the ill-effects associated with repeated exposure to these high concentrations of magical power.
AD&D Monster Manual part 48
7 hours ago