This bonus pack contains extra content for Overboss. -1 set of 12 Tower terrain tiles, with corresponding monster (10) & crystal (1) tokens -2 bonus boss cards: "The Collective" and "The Brothers Wise" -1 special backer's token bag (purple and gold with the Overboss logo and "Original Backer") -2 bonus Overboss-themed promo cards for Boss Monster: "The Collective" boss card and "Overworld Gate" room card This was a stretch goal in the Overboss Kickstarter campaign. It will not be included in the retail version of the base game. In the future, it may be available (in whole or in part) at conventions, on the publisher's website, or in retailer incentive kits. Tower tiles allow a stack of up to three monsters, with the topmost monster considered for scoring bands and other effects. Tower tiles earn 1 point each plus 1 point per monster stacked upon it.