Yep, what Haynar said.
The purpose of invisible NPCs are to run a background script and control some custom event, something like the Ragefire spawn cycle. Since the invisibe NPC is not there anymore, I suspect he was moved out of the lair (better yet accidentally removed from the zone) and that basically broke the Ragefire spawn script. This is only my assumption, but regardless, the spawn cycle is broken atm.
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