They've activated the self-delete! Nah, I'm just messing with you.
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The Feywild Decay Spirit was an, in Thiswell's words, "trivial spirit" that lived in a forest about a week NNW of the place in the Feywild corresponding to Castle. Morduval arranged for it to receive the Colana Dialiah, causing it to grow swiftly and continuously to immense size, at a rate of about 5 km per day according to Menyareth.