Games like The Warhorn
Games like The Warhorn include Rust, Terraria, The Forest, ARK: Survival Evolved, and Valheim. We matched them by the tags players give The Warhorn on Steam (RPG, Adventure, Indie, Action, and Open World Survival Craft): closest matches first, and among equally close ones the better-known games.

Rust
Shared: Survival · Open World Survival Craft · Adventure

Terraria
Shared: Open World Survival Craft · Adventure · Survival

The Forest
Shared: Open World Survival Craft · Adventure · Survival

ARK: Survival Evolved
Shared: Open World Survival Craft · Survival · Adventure

Valheim
Shared: Open World Survival Craft · Survival · Open World

Palworld
Shared: Survival · Open World · Open World Survival Craft

Don't Starve Together
Shared: Open World Survival Craft · Adventure · Survival

Once Human
Shared: Action · Open World · Survival

Conan Exiles Enhanced
Shared: Survival · Open World Survival Craft · Open World

Craftopia
Shared: RPG · Open World · Open World Survival Craft

Last Oasis
Shared: RPG · Adventure · Action

Starbound
Shared: Open World Survival Craft · Adventure · Survival

Necesse
Shared: Open World Survival Craft · Adventure · Open World

Raft
Shared: Open World Survival Craft · Survival · Adventure

Project Zomboid
Shared: Survival · Open World Survival Craft · Open World

7 Days to Die
Shared: Survival · Open World Survival Craft · Open World

Don't Starve
Shared: Adventure · Open World Survival Craft · Indie

TerraTech
Shared: Open World Survival Craft · Building · Open World

RuneScape: Dragonwilds
Shared: Open World Survival Craft · Survival · Open World

ARK: Survival Ascended
Shared: Survival · Adventure · Open World

Green Hell
Shared: Open World Survival Craft · Survival · Action

Core Keeper
Shared: Survival · Open World · Exploration

Enshrouded
Shared: RPG · Survival · Open World

No Man's Sky
Shared: Open World Survival Craft · Open World · Adventure