On May 26, 2026 at 11:00 PT, Piranha Games shipped Chaos Reign — the largest expansion for MechWarrior 5: Mercenaries since the base game. The DLC adds a full story campaign, a brand-new Guerrilla Warfare mode, and 10 chassis from the Clan Invasion era. For a series that’s been around since 1989, this is a meaningful return to the BattleTech roots.
What’s in the box
New campaign and mode
- Story campaign — a continuation of the Mercenaries main arc, focused on the conflict between the Inner Sphere and the Clans.
- Guerrilla Warfare — a new mission type built around stealth, asymmetric skirmishes and partisan tactics. From the description it reads like a closer cousin of the Heroes of the Inner Sphere DLC, just with a different tempo.
New mechs
Inner Sphere:
- Sunder — the only new Inner Sphere OmniMech in the pack (rare; Inner Sphere usually gets BattleMechs).
- BushWacker, Shadow Hawk IIC, Jenner IIC, Kodiak, Incubus — BattleMechs.
Clan OmniMechs:
- Linebacker, Ebon Jaguar, Night Gyr, Naga — all four well known from MechWarrior Online and tabletop BattleTech.
Kodiak and Ebon Jaguar are fan favorites — the community had been asking for them in Mercenaries since 2021.
Weapons
- Arrow IV artillery — guided artillery with target designation.
- MRM launchers (Medium Range Missiles) — sit between LRM and SRM in their role.
- X-Pulse lasers — upgraded pulse-laser variant.
- Light autocannons — small-bore AC with high fire rate.
- Clan heavy lasers — high-damage but very hot Clan-tech lasers.
Why this matters now
MechWarrior 5: Mercenaries originally shipped in December 2019 and has been supported ever since. Over 6.5 years it has received seven major DLCs; Chaos Reign is the seventh, and reportedly the last before Piranha moves to a brand-new project (likely MechWarrior 6, with a Gamescom 2026 reveal expected).
The expansion sells for $19.99, with a Complete Edition (all 7 DLCs) discounted on Steam alongside the release.
For the series this is a notable moment: the sim-mech niche has almost vanished from AAA, and Piranha is effectively the only studio still shipping large-scale controllable-mech content reliably, after 35 years.
What this means for the IVSOFTE audience
MechWarrior 5 is a single-player game with co-op up to 4 players, with no VAC/EAC and no HWID blocks. It’s one of the rare AAA cases where:
- No anti-cheat — mods, build tweaks, trainers all work without ban risk.
- Co-op via Steam P2P — private sessions with no dedicated servers, minimal attack surface.
- Lifetime ownership — a regular Steam key, classic model.
If you’re burned out on daily live-service grinds and want a full single-player campaign with heavy mechs, Chaos Reign easily covers 30–40 hours.
In our games catalog we cover the directions where MechWarrior audiences tend to overlap: story-driven ARPGs, tactics, sim campaigns. Looking for a summer AAA without seasonal deadlines? This is a strong pick.
Sources
Piranha Games official announcement (May 26, 2026), Steam page for Chaos Reign, ResetEra thread breaking down the 90s BattleTech callbacks in the launch trailer.
Want to play at the top of your game?
Verified cheats and software — updates within 12–48 hours after major patches, with guarantees and 24/7 support.