Opetherion has 2 Avantasia concerts.

Avantasia is a German supergroup metal opera project created by Tobias Sammet, vocalist of the band Edguy. It has been characterized as a rock opera, as it features the contributions of various vocalists and musicians and it consists of concept albums. Conceived in 1999 as studio-only, two-album project, Avantasia has since released seven other studio albums and has toured the world multiple times. It can be divided into four periods of activity. The first...