Maegera

Maegera (also known as Maegera the Inferno ) was a primordial, fiery, god-like being whose immense heat was harnessed to power the Great Forge of the dwarven city of Gauntlgrym.

Background
Maegera was trapped in the Fiery Pit in Gauntlgrym, a large chasm filled with magma. It was kept in a state of slumber and semi-consciousness by bound water elementals, conjured by the Arcane Brotherhood.

In 1452 DR, agents of Thay used a dwarf of Delzoun to pull a lever at the side of the fiery pit, closing the channels of water and allowing Maegera to stir and wake up, which caused earthquakes in the surrounding area.

Maegera was put back into its slumber state by a group containing Drizzt Do'Urden, Bruenor Battlehammer and Jarlaxle Baenre, but they did not restore all of the water elementals since one of the summoning locations was broken.