Kaon is a chaos god who was worshiped by a cult of High Elves who took control of the Lyceum of Ingolas. The chaotic beings from his plane of existence have made an incursion in many areas close to Leth Nurae, often manifesting as corrupted fey and spiders.
Relevant Lore:
You ask, "Who are the followers of Kaon?"
Byron Wade says, "I think the Kaon are beings from beyond Telon. They are trying to accomplish some great magical feat. But to what end? It's hard to say. Whatever it is they wish to accomplish cannot be allowed!"
- Tavern Conversation, Veskal's Exchange (Outpost)