Chaos
Chaos is the Father of All and of Nothing. Before there was time there was only Chaos, and the gods came out of him. He stands with none of the three pantheons and is neither good, neutral nor evil: every god was born of him, and every god must hold him back. Wherever the world is wild, broken or new, the hand of Chaos is near.
When Reorx forged the world, he caught a spark of Chaos in a gem of gray stone, the Graygem of Gargath. Nothing the Graygem passes stays as it was. The gnomes who chased it across Krynn became the first dwarves and the first kender, and the hunt for it has never ended.
Chaos has no clerics, no temples and no holy symbol, and no mortal may devote themselves to him. Those who call on his name rarely like what answers.
See also Gods of Krynn, Gods of Good, Gods of Neutrality, Gods of Evil