Tantibus means Nightmare in Latin

The mane six's nightmares were fun. Fluttershy wants to be a pet. Rainbow Dash has nightmares about sickening cuteness.

And all of the Ponyville getting involved in the dream battle was really cool. Fluttershy turned into Flutterbat and bit. I believe that's the first time she's ever actually fought. It's unfortunate that Pinkie didn't really do much. She probably would have done something awesome.

This was a really great episode for Luna.