Pennasis

Pennasis (from old Alternian penna, meaning wing) is a mutation identified by the appearance of large wings on a troll's back after pupation.

Famous trolls with pennasis

 * Rufioh Nitram

In popular culture

 * The namesake and main character of the Pupa Pan series is identified by his ability to fly. While it is not specified that this was a result of pennasis, most early and modern visual interpretations of the story run with this concept.