Games like Undying One
Games like Undying One include Total War: WARHAMMER, Kingdom Heroes 8, The Last Spell, Total War: WARHAMMER III, and Total War: WARHAMMER II. We matched them by the tags players give Undying One on Steam (Tactical RPG, RPG, Real Time Tactics, Strategy, and Roguelite): closest matches first, and among equally close ones the better-known games.

Total War: WARHAMMER
Shared: RPG · Strategy · Tactical RPG

Kingdom Heroes 8
Shared: Tactical RPG · Real Time Tactics · Strategy

The Last Spell
Shared: RPG · Strategy · Tactical RPG

Total War: WARHAMMER III
Shared: Strategy · Real Time Tactics · RTS

Total War: WARHAMMER II
Shared: Strategy · RTS · Action

The Banner Saga
Shared: Tactical RPG · RPG · Strategy

Touhou Monster TD ~ 幻想乡妖怪塔防
Shared: Tactical RPG · RPG · Real Time Tactics

Loop Hero
Shared: Roguelite · Roguelike · Strategy RPG

Hades II
Shared: Action · Roguelite · RPG

Gladiator Guild Manager
Shared: RPG · Strategy · Tactical RPG

鬼谷八荒 Tale of Immortal
Shared: RPG · Tactical RPG · Action

Hades
Shared: Roguelite · Action · RPG

Symphony of War: The Nephilim Saga
Shared: Tactical RPG · RPG · Strategy RPG

Fell Seal: Arbiter's Mark
Shared: RPG · Strategy · Tactical RPG

Inkbound
Shared: Tactical RPG · Roguelite · Strategy

9 Kings
Shared: RPG · Strategy · Roguelite

Warhammer 40,000: Rogue Trader
Shared: RPG · Tactical RPG · Strategy

Darkest Dungeon®
Shared: RPG · Roguelike · Strategy

The King is Watching
Shared: Strategy · Roguelike · RTS

Super Fantasy Kingdom
Shared: RPG · Strategy · Roguelite

Vampire Survivors
Shared: Roguelite · 2D · Action

Crown and Adventure
Shared: Tactical RPG · Real Time Tactics · RPG

Halls of Torment
Shared: Roguelite · RPG · Action

Death Must Die
Shared: RPG · Roguelite · Action