Games like Realm's Crossing
Games like Realm's Crossing include Root, Axis and Allies 1942 Online, Total War: WARHAMMER II, Mechabellum, and Dota Underlords. We matched them by the tags players give Realm's Crossing on Steam (Strategy, Wargame, Tactical, Turn-Based Strategy, and Board Game): closest matches first, and among equally close ones the better-known games.

Root
Shared: Strategy · Board Game · Wargame

Axis and Allies 1942 Online
Shared: Wargame · Strategy · Board Game

Total War: WARHAMMER II
Shared: Strategy · Turn-Based Strategy · Tactical

Mechabellum
Shared: Strategy · Wargame · Auto Battler

Dota Underlords
Shared: Strategy · Tactical · Auto Battler

Ultimate General: Civil War
Shared: Wargame · Strategy · Tabletop

Total War: WARHAMMER III
Shared: Strategy · Turn-Based Strategy · Tactical

Total War: ROME II - Emperor Edition
Shared: Strategy · Turn-Based Strategy · Tactical

Battle Brothers
Shared: Strategy · Turn-Based Strategy · Tactical

Sid Meier’s Civilization® VI
Shared: Strategy · Turn-Based Strategy · Tactical

Foxhole
Shared: Wargame · Strategy · Tactical

XCOM: Enemy Unknown
Shared: Strategy · Tactical · Turn-Based Strategy

Heroes of Might and Magic: Olden Era
Shared: Strategy · Turn-Based Strategy · Tactical

Total War: THREE KINGDOMS
Shared: Strategy · Turn-Based Strategy · Tactical

Twilight Struggle
Shared: Strategy · Board Game · Wargame

Blood Bowl 2: Legendary Edition (Classic)
Shared: Strategy · Board Game · Turn-Based Strategy

Total War: ATTILA
Shared: Strategy · Turn-Based Strategy · Tactical

MENACE
Shared: Strategy · Turn-Based Strategy · Tactical

Armello
Shared: Board Game · Turn-Based Strategy · Strategy

Total War: EMPIRE – Definitive Edition
Shared: Strategy · Turn-Based Strategy · Tactical

ROMANCE OF THE THREE KINGDOMS XIV
Shared: Wargame · Turn-Based Tactics · Strategy

Space Hulk (Classic)
Shared: Strategy · Turn-Based Strategy · Board Game

Total War: ROME REMASTERED
Shared: Strategy · Turn-Based Strategy · Wargame

Total War: MEDIEVAL II – Definitive Edition
Shared: Strategy · Turn-Based Strategy · Tactical