Arhallogen is the Spider King, God of Spiders.
Although a member of the Animal Court, and therefore presumably True Neutral, he actually has closer associations with the Dark Lords. This is because he is almost never portrayed as neutral but on the side of Death and his minions. He was with Death in the First Battle and is perceived to have stayed with that side throughout Titan's history. His part in that battle is remembered in the constellation bearing his name in the Southern Skies of Titan.
He is closely associated with Hmurresh and Siluva and he is the brother of Rikat. These four deities together are the High Lords of the Invertebrates.