The Arcadia Crossover Kit includes Hero Boards and Hero Cards to bring all of the Heroes from the two Arcadia Quest core boxes and two expansions to your games of Masmorra. That's a 28 Heroes, which means 28 Hero Boards and 56 Hero Cards are included in the Arcadia Crossover Kit.
The Arcadia Crossover Kit does not contain figures, if you want to properly use these Heroes, you will need to have the Arcadia Quest core box or expansion that contains their figures. Here's the complete list of the Heroes contained in this kit, and what Arcadia Quest box they come from:
Arcadia Quest:
Grom
Scarlet
Greensleeves
Johan
Maya
Seth
Kanga
Spike
Diva
Wisp
Zazu
Hobsbawm
Arcadia Quest - Inferno:
Bjor
Cassius
Diana
Izzy
Jack Jack
Jaimie
Kisha
Mark
Natasha
Phyx
Sybbyl
Trandir
Arcadia Quest - Beyond the Grave:
Chaz
Darryn
Arcadia Quest - Pets:
Greenhood
Oak