This is a pack of 14 thick cardboard Hero Sheets for all heroes that were available during the Sword & Sorcery Immortal Souls Kickstarter Campaign (a.k.a. season one). These replace the thin card Hero Sheets that come with the 5 heroes from the base Sword & Sorcery: Immortal Souls game, the 8 heroes that come in their own individual Hero Packs, and the Kickstarter-exclusive Hero Tristan: Standard Bearer/Warlord. Backers of that campaign received these as a stretch goal.
These were offered as an add-on in the pledge manager for the Sword & Sorcery: Ancient Chronicles Kickstarter campaign (a.k.a. season two), which already included Enhanced Hero Sheets for all season two heroes, allowing those with retail versions of the "Season 1" items to have the enhanced sheets. Ares Games notes that these add-on enhances sheets have 1 armor printed on them like the "Season 2" heroes, so that these original heroes are ready for play in Ancient Chronicles out of the gate without needing to add armor cards to them.