: I certainly don't think there were any Dragons left. Minor
: Wyrms maybe. Probably some orcs left hiding in the mountains
: etc..

Tolkien decided there were no more great dragons, but there were indeed dragons (what you call "Minor Wyrms", but he made no distinction). Chrysophylax is one of the later dragons, for instance.

The Orcs would be left, too, and trolls and other evil creatures like the great spiders.

Healso speculated that the Blue Wizards, Alatar and Palando, may have begun cults of magic, so they might have survived into the Fourth Age.

I don't believe it was Tolkien's intention to have any other Balrogs remaining. The passage at the end of THE SILMARILLION is incongruous with some other sources.

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