Xolotl

Xolotl is a malevolent deity native to Aztec mythology and has multiple spheres of influence, most notably he is seen as the god of lightning, death, sunset, monsters, sickness and deformities - he was also said to rule over twins and dogs, as such he often manifested as a monstrous dog and would use dogs as a means to gather souls to the underworld.

He was also seen as the dark personification of Venus and was associated with heavenly fire - he was the dark counterpart of Quetzalcoatl, who was a more benevolent version of Xolotl (though all Aztec deities were somewhat malicious by modern standards).