Beucephalus is a nightmare, which is a horse with flaming hooves that can fly. Beucephalus is Strahd's mount, and is sometimes known as "Beucephalus the Wonder Horse".

When the group traveled into Barovia's past, Beucephalus was a normal horse. When Strahd rode Beucephalus, chasing the carriage, Murderbot tried to kill it with a dart, but was unsuccessful.[1]Strix shot a fire bolt at the horse, but the dark powers used the magical flame to transform it into a nightmare.[2]

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