User blog comment:Gojira57/What is Bonedaemon? A Monster Teaser for MHEX2/@comment-15446856-20151118214946/@comment-4732465-20151119134552

You are correct about the fact it would appear after Vengeful Kalamos' defeat. The Kalamos would have not noticed the Bonedaemon regardless, since it did not look like a prey item to the elder dragon. But the Bonedaemon's natural predators did, and now thaat the predators are now gone, the Bonedaemon was able to assert itself as a top predator of the Dead Forest, growing bigger and bigger.