Professor Igor - Episode List

The Obsidian Tale:

Volume 1: Search - 2 episodes
Episode 05 - Kyrie Escapees [November 1, 2014] [cameo]
Episode 06 - Magic Synthesis [November 8, 2014] [cameo]

Volume 2: Regroup - 0 episodes

Volume 3: Secrets - 0 episodes

Volume 4: Desertion - 2 episodes
Episode 47 - Airship Wolfram [August 22, 2015] 
Episode 48 - Tree of Revision [August 28, 2015]

Volume 5: Innovation - 6 episodes
Episode 54 - Exiled Arrival [October 10, 2015] [cameo]
Episode 55 - War of the Central World [October 17, 2015] [cameo]
Episode 56 - To My Family and Friends [October 24, 2015] [cameo]
Episode 57 - Conclusion to a Vivid Strife [October 31, 2015] [cameo]
Episode 60 - How to Save Faith [November 21, 2015] [cameo]
Episode 63 - 1,000 Years Ago [December 12, 2015]