Games like Tactics V: "Obsidian Brigade"
Games like Tactics V: "Obsidian Brigade" include The Last Spell, Jagged Alliance 3, Battle Brothers, MENACE, and XCOM 2. We matched them by the tags players give Tactics V: "Obsidian Brigade" on Steam (Strategy, RPG, Turn-Based, Turn-Based Tactics, and Tactical): closest matches first, and among equally close ones the better-known games.

The Last Spell
Shared: Strategy · RPG · Turn-Based Tactics

Jagged Alliance 3
Shared: Strategy · Turn-Based Tactics · Tactical

Battle Brothers
Shared: Strategy · RPG · Turn-Based Tactics

MENACE
Shared: Strategy · RPG · Turn-Based Tactics

XCOM 2
Shared: Strategy · RPG · Tactical

XCOM®: Chimera Squad
Shared: Strategy · Turn-Based Tactics · Turn-Based

Fell Seal: Arbiter's Mark
Shared: Strategy · RPG · Turn-Based Tactics

STAR WARS Zero Company™
Shared: Turn-Based Tactics · Strategy · Turn-Based

The Banner Saga
Shared: Turn-Based · RPG · Strategy

Disgaea 5 Complete
Shared: Strategy · RPG · Turn-Based Tactics

Xenonauts 2
Shared: Strategy · RPG · Turn-Based Tactics

Mordheim: City of the Damned
Shared: RPG · Strategy · Turn-Based

Songs of Conquest
Shared: Turn-Based Tactics · Tactical · Strategy

Mutant Year Zero: Road to Eden
Shared: Strategy · RPG · Turn-Based Tactics

Wargroove
Shared: Strategy · Turn-Based Tactics · Turn-Based

TROUBLESHOOTER: Abandoned Children
Shared: Turn-Based Tactics · Turn-Based · Tactical RPG

Marvels Midnight Suns Digital Edition
Shared: Turn-Based Tactics · Tactical RPG · RPG

Warhammer 40,000: Chaos Gate - Daemonhunters
Shared: Turn-Based Tactics · Strategy · Tactical

Gears Tactics
Shared: Strategy · Turn-Based · Turn-Based Tactics

Into the Breach
Shared: Strategy · Turn-Based Tactics · Turn-Based Strategy

Warhammer 40,000: Mechanicus
Shared: Strategy · Turn-Based Tactics · Turn-Based

Banner of the Maid
Shared: Strategy · RPG · Turn-Based Tactics

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

Disgaea PC
Shared: Turn-Based · RPG · Strategy RPG