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Rival Books of Aster
Rival Books of Aster is a strategy deck building game that features over 140 hand illustrated spells that you can use to build custom decks and go head to head against other players. Each spell is also a page in a living story book that translates itself and reveals its secrets as you play the game.
What players say
Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-09-26.
“This is my first Steam review, because honestly this game I feel needs to get popular. I play Shadowverse mainly and if you know anything of that game, last expansion ruined it for me like it did others and on my quest to find a new digital CCG, GWENT just didn't interest me, HS…”
— a player, Steam review · 5 hrs played“A very refreshingly different CCG. Its strongest selling point is its bizarre artwork - It all looks like something from an ancient medieval manuscript, and a lot of the creatures are freaky demonic beasts. Some of the art is very pretty, as well. My favourite is the tower with…”
— a player, Steam review · 3 hrs played“You can´t unlock cards without paying. It is a mobile port with really poor optimization for pc. There are 15 free card games on steam that are 15 times better than this one, go play the others and save 1 hour of your time.”
— a player, Steam review · 1 hrs playedLatest official news
Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.
Release notes build #2079684
New Features Added Page flipping animation to chronicles Added hint lines to tutorials Darkened background for dialogs Show message when deck runs out of cards Added indicators for chronicles unlock p
Release notes build #2079684
New Features Added Page flipping animation to chronicles Added hint lines to tutorials Darkened background for dialogs Show message when deck runs out of cards Added indicators for chronicles unlock p
Release notes - build 1994824
New Features Show recently played users on the multiplayer screen Show your avatar in more places Added shadows to chronicles pages Bug Fixes Fixed multiple issues related to playing cards rapidly Fix
Release notes - build 1994824
New Features Show recently played users on the multiplayer screen Show your avatar in more places Added shadows to chronicles pages Bug Fixes Fixed multiple issues related to playing cards rapidly Fix
RBA - Major Update
Hi all, We are happy to announce the release of a major update for Rival Books of Aster! Our devs have been hard at work implementing new features and bug fixes which will be outlined in detail below.
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Screenshots
Official Steam store screenshots — click any shot to enlarge.
Facts & details
From the Steam store record, snapshot 2026-09-26.
| Genres | Casual, Indie, Strategy |
| Player tags | Strategy · Indie · Casual · Card Game · Free to Play · Early Access (SteamSpy community voting) |
| Features | Multi-player · PvP · Online PvP · Cross-Platform Multiplayer · Family Sharing |
| Languages | English * * |
| Official site | http://rivalbooks.com |
Minimum system requirements (PC)
Minimum: OS: 10 Memory: 1 GB RAM DirectX: Version 9.0 Storage: 500 MB available space