Rivandy is an online Battle Royale & Dungeon Crawler set in a 3D open world. The game is centred on 2 game modes: the Dungeon Crawler mode allows you to unlock creatures. The other lets you play against opponents as you climb the rankings: Battle Royale.

Battle royale: Players are dropped onto an island/vast map where they must battle each other until only one survivor or team remains. The game must support a significant number of players simultaneously (30-100 players). The PvE Dungeons (Sanctuaries) aspect allows players to unlock reincarnations as well as exclusive rewards.
Dungeon Crawler: The PvE dungeons aspect (Sanctuaries) allows players to unlock reincarnations. To obtain a reincarnation/spirit, you need to finish the dungeon without dying. To put it simply, there's an infinite variety of dungeons with a real objective and real difficulty.
The two modes complement each other as one allows you to unlock your creatures, and the other enables you to face off against online players.