Octavarius is an independent Chicago improv group that was formed in April of 2009. It's members are mostly comprised of alumni spanning across 5 years of Illinois State University's Improv Mafia. They have performed all over the city, but currently can be found performing at Comedy Sportz Chicago. 
In 2011, Octavarius was voted Best Improv/Sketch group by the Chicago Reader. The year before they were runner up in the same category.