If you buy the pass, which lasts 30 days, you'll get a golden border for your avatar, golden paint for your chat messages and a gold effect on your damage projectiles. You'll also get a Baby Roshan courier as your chess player, as well as the right to vote on new chess pieces or pieces that need rebalancing.
Lastly, grabbing the pass unlocks a daily first win bonus: with the pass active you'll receive five bonus candy for your first top three finish every day, and another five for your first outright win.
DOTA AUTO CHESS Custom Game PassThis pass activates premium content in the DOTA AUTO CHESS custom game and supports the creators of this custom game.Owning a DOTA AUTO CHESS Custom Game Pass will unlock pic.twitter.com/4BRH4RiSaNJune 1, 2019
The Drodo Studio team said buying the pass "supports the game and allows us to build content better, faster, more consistently".
Last week, Valve announced it was working on its own version of Dota Auto Chess, and promised more information "soon".