Games like Sera Dion: Survivor
Games like Sera Dion: Survivor include Risk of Rain 2, ELDEN RING NIGHTREIGN, Gunfire Reborn, Brotato, and Ravenswatch. We matched them by the tags players give Sera Dion: Survivor on Steam (Action Roguelike, Multiplayer, Dark Fantasy, Online Co-Op, and Roguelike): closest matches first, and among equally close ones the better-known games.

Risk of Rain 2
Shared: Action Roguelike · Multiplayer · Roguelike

ELDEN RING NIGHTREIGN
Shared: Multiplayer · Online Co-Op · Roguelike

Gunfire Reborn
Shared: Roguelike · Roguelite · Online Co-Op

Brotato
Shared: Action Roguelike · Roguelike · Multiplayer

Ravenswatch
Shared: Action Roguelike · Roguelike · Online Co-Op

Children of Morta
Shared: Multiplayer · Roguelike · Action Roguelike

HELLDIVERS™ 2
Shared: Online Co-Op · Multiplayer · PvE

The Spell Brigade
Shared: Online Co-Op · Action Roguelike · Roguelite

Risk of Rain Returns
Shared: Action Roguelike · Multiplayer · Online Co-Op

Streets of Rogue
Shared: Action Roguelike · Multiplayer · Roguelite

Lost Castle 2
Shared: Multiplayer · Online Co-Op · Roguelike

LORT
Shared: Action Roguelike · Online Co-Op · Roguelike

Ship of Fools
Shared: Action Roguelike · Online Co-Op · Roguelite

Vampire Survivors
Shared: Action Roguelike · Roguelite · Roguelike

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Roguelike · Indie

Warhammer: Vermintide 2
Shared: Dark Fantasy · Multiplayer · Online Co-Op

Hades
Shared: Action Roguelike · Roguelite · Roguelike

Enter the Gungeon
Shared: Action Roguelike · Roguelike · Multiplayer

Barony
Shared: Multiplayer · Action Roguelike · Roguelike

Ember Knights
Shared: Action Roguelike · Multiplayer · Roguelite

SYNTHETIK: Legion Rising
Shared: Action Roguelike · Roguelite · Online Co-Op

The Binding of Isaac
Shared: Action Roguelike · Roguelike · Procedural Generation

Risk of Rain (2013)
Shared: Action Roguelike · Roguelike · Online Co-Op

Halls of Torment
Shared: Action Roguelike · Dark Fantasy · Roguelite