Quick answer: Undead Legacy is the survival-realism overhaul for 7 Days to Die, built by Subquake since Alpha 11. The current stable build supports 7DTD V1.0 Full Release with eight class professions, full item durability, weapon attachments, vehicle maintenance, temperature and nutrition pressure, and an overhauled zombie AI. The next major version, 2.7, has been in active development through 2025 and into 2026, targeting the V2.0 line of 7DTD with a redesigned skill tree and reworked tool progression. This guide covers what Undead Legacy actually changes, where 2.7 stands, install and server setup, and what hardware you need to run it.
What Undead Legacy is and is not
Undead Legacy is not a content mod that bolts on extras. It is a full overhaul of the survival simulation, layered onto the 7DTD core. Subquake started the project in 2017, shipped the first stable in November of that year, and has spent the following eight years deepening every system the base game treats lightly: durability, repair, weapon modification, vehicle wear, electricity, temperature, nutrition, and zombie behaviour.
The mod is famously slower than vanilla. A new character in Undead Legacy spends the first ten in-game days scavenging tools that work and food that does not spoil. Crafting a single firearm requires sourcing the parts, the proper workstation, and the skill investment to assemble it. Zombies are not impossible, but they hit harder and they are persistent. The trade-off is depth: players who finish a 90-day Undead Legacy save report a sense of accomplishment that vanilla rarely produces.
The eight professions
Undead Legacy’s progression revolves around eight class professions, each with its own perk tree, starting items, and gameplay loop:
- Craftsman. Generalist crafter. Strongest early-game versatility, weakest specialisation. Pick this if you do not yet know what you want to be.
- Mechanic. Vehicles, engine repair, fuel economy, parts crafting. The mechanic keeps the team mobile and is the best path to motorcycles and trucks.
- Electrician. Wiring, generators, solar power, automated defences. The electrician unlocks the base-defence tech tree.
- Soldier. Combat-focused. Faster weapon use, better gun handling, melee bonuses. The fighter of any party.
- Scavenger. Loot efficiency, container variety, scavenge speed. The scavenger is the supply line of the team.
- Farmer. Crop yields, animal husbandry, food preservation. Critical past day 30 when canned food runs out.
- Scientist. Medicine, chemistry, mutation research. The scientist crafts antibiotics, antitoxins, and advanced ammunition.
- Engineer. Construction, blueprints, advanced workstations. The engineer is the base-builder.
A typical Undead Legacy multiplayer group has one of each class plus rotating utility roles. Solo players are expected to pick one profession and lean into it, accepting that other paths will be slower without dedicated specialists.
What Undead Legacy changes about the survival loop
Durability and repair
Every item in Undead Legacy has durability. Tools degrade. Weapons jam, wear, and eventually break. Repair requires the right kit and the right material. A pipe wrench cannot fix a power drill. A scrap iron repair kit does not restore a steel tool to maximum condition. The repair economy is the central pressure of the early and mid game, and it is the system most players first feel when transitioning from vanilla.
Weapon attachments
Weapons accept attachments: scopes, grips, suppressors, magazine extensions. Each attachment has crafting requirements and durability of its own. Late-game Undead Legacy builds revolve around customising the perfect rifle for the player’s combat style. This is the mod’s loot-game equivalent: the joy is not finding a legendary, it is building one.
Vehicles
Vehicles consume fuel, wear out their engines, and require maintenance parts to keep running. A truck that has not been serviced will stop running mid-trip. This forces the mechanic role into relevance and makes the convoy decision (who drives, who tunes, who carries spare parts) a real choice on multi-day expeditions.
Electricity
Electrical systems are deeper than vanilla. Generators, solar arrays, wind turbines (limited), batteries, capacitors, and automated turrets all draw real power. Wiring matters. Late-game Undead Legacy bases are small power grids, with the electrician keeping load balanced across defence and crafting needs.
Temperature and nutrition
Cold kills you. Heat exhausts you. Calories matter, but so does nutrient variety. A diet of only canned food causes deficiencies that lower stats. The farmer role gains its full importance here, since fresh produce becomes a strategic resource rather than a flavour choice.
Zombie AI
Undead Legacy zombies are smarter, more persistent, and more variant than vanilla. New enemy types include faster runners, armoured walkers, and special infected with unique behaviours. The horde nights remain the high-pressure event but the day-to-day zombie encounters carry more risk than vanilla, which keeps the world feeling dangerous past day 10.
What is coming in 2.7
The current Undead Legacy stable targets 7DTD V1.0 Full Release. The next major update, version 2.7, has been in active development through 2025 and into 2026. Subquake has previewed several pieces of the 2.7 build through the project’s dev channels:
- A redesigned skill tree. Community previews show a deeper, more branched tree with class-specific late-game specialisations, with depth that has drawn favourable comparisons to ARPG progression systems.
- New tools and recipes. Subquake has shown a new sickle tool for crop harvesting, electric stoves, and other workstation upgrades. The visible progression: the mod is filling in the gaps players have asked about for years.
- V2.0 compatibility. The 2.7 update is being built against the 7DTD V2.0 codebase, not just V1.0. Once it ships, players will be able to run Undead Legacy on top of the same V2.x base most other 2026 mods target.
There is no committed release date for 2.7. Subquake’s public update cadence is irregular and the project is supported by Patreon backers. The community sentiment in 2026 is patient: most active Undead Legacy players are happy to wait, given the depth of the previews.
How to install Undead Legacy
Three install paths cover most setups:
- 7D2D Mod Launcher. Search “Undead Legacy”, select the build that matches your 7DTD version, install. The Mod Launcher pins the version automatically, which avoids client-server mismatches.
- Manual install. Download from ul.subquake.com, extract to your 7DTD Mods folder. For multiplayer, install on both client and server. Take a save backup before applying the mod over an existing world.
- Dedicated server upload. Most hosting panels accept the Undead Legacy zip and install both sides for you. Server plans M, L, and XL on supercraft.host include one-click Undead Legacy setup.
Compatibility with other mods is limited. Undead Legacy is opinionated about almost every system, which means stacking other content mods often produces conflicts. The mod that pairs cleanly is CompoPack, which adds POIs without touching mechanics. The Project Z zombie-content mod is also reported as compatible by community players running both together. Beyond those two, treat Undead Legacy as a closed loadout.
Server hosting requirements
Undead Legacy is the most resource-hungry mainstream 7DTD overhaul because of its durability and AI complexity. Practical 2026 numbers for a comfortable session:
| Player count | Recommended plan | RAM | CPU cores |
|---|---|---|---|
| 1-4 players | Plan M | 12 GB | 3 |
| 4-8 players | Plan L | 16 GB | 3-4 |
| 8-16 players | Plan L | 16+ GB | 4 |
| 16+ players | Plan XL | 24+ GB | 4-6 |
The single biggest hardware demand is the durability simulation. Every entity in the world tracks state at a higher resolution than vanilla, which produces a steady CPU load that does not spike but never falls to zero either. Server hosts running mixed game catalogues should treat Undead Legacy as the heaviest 7DTD load they will encounter.
Should you start Undead Legacy now or wait for 2.7?
The honest answer depends on your patience:
- Start now if you want to learn the mod’s systems in their current form. The V1.0 build is content-complete and stable. A 60 to 90 day playthrough will fill the time before 2.7 arrives.
- Wait for 2.7 if you only get one 7DTD overhaul playthrough in 2026 and want the latest skill tree and tool progression. The trade-off is that 2.7 has no firm release date.
For community servers, the practical recommendation is to run a V1.0 Undead Legacy season now, plan a wipe for the 2.7 release window, and treat the wait as expected. Servers that try to pre-empt 2.7 by patching the V1.0 build with unofficial changes typically end up in worse shape than ones that hold steady.
Why Undead Legacy still matters in 2026
The base game’s mixed reception in V2.x has elevated Undead Legacy from “one of three big overhauls” to “the survival overhaul community is actively waiting for.” That is unusual positioning for a fan project. The depth of the durability and crafting systems, the discipline of the eight profession design, and Subquake’s transparent dev process have earned Undead Legacy a level of trust that the base game has been steadily losing. For players who care about simulation depth and slow progression, the mod is the version of 7 Days to Die the community treats as canon.