Immortalizer
Immortalizer is a Fabric mod for Minecraft 1.21.11 that toggles immortality on mobs and other living entities through commands.
What it does
Immortalizer adds commands that mark a mob as immortal, so it cannot be killed by ordinary damage. A player or command block targets one or more living entities and flips their immortality flag on or off. Targeting works the same way as the entity selector in vanilla /give, so a single mob, a group, or every matching entity in an area can be changed at once.
The mod also includes an item-based route: the author describes an item that targets mobs for immortalization, and an attack that makes an immortal mob mortal again. Players who build arenas, boss rooms or protected animals on a world or server can use the toggle to control which entities stay alive. Installation covers the server and each player's game. Files are published for Fabric only, and the 1.21.11 build is the only game version currently listed.
Immortalizer has no dependencies beyond Fabric. Its license is All rights reserved, which means it is not open source, and the source code is not offered under a free license.
Key features
Immortality command
A command sets or clears the immortal state of targeted mobs, using the same target syntax as vanilla entity selectors.
Toggle on any living entity
The toggle applies to any LivingEntity, so players, mobs and other living targets can all be marked immortal.
Tracked immortality value
Each targeted entity keeps a tracked immortality value that the toggle changes, so the state persists on that entity.
Item targeting
An item can be used to choose which mobs become immortal, giving a way to mark mobs without typing commands.
Reverse attack
A specific attack makes an immortal mob mortal again, returning it to normal damage handling.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Server owners who run mob-based challenges, map makers who script encounters, and players who want certain mobs to stay alive in a world.
Questions
Does Immortalizer need Fabric API?
Does the server need Immortalizer installed?
Which Minecraft version does Immortalizer support?
Can Immortalizer be modified or redistributed?
In the catalog
Immortalizer is one of 11,058 Mobs mods on ModsFinder, and one of 5,189 Mobs mods for Fabric. 19,862 mods support Minecraft 1.21.11.
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What the author says
Immortalizer is directly inspired by a post I saw on Reddit by u/LeadershipFlimsy9676 which requested a way to "immortalize mobs that normally can't be," I figured I could do something along those lines. So... In an effort to give some viability to this item in a Survival playthrough, I have made the recipe rather…
Official listing
- Modrinth page
- modrinth.com/mod/immortalizer
- Owner
- jason13official
- Published
- 2026-04-25
- Updated on Modrinth
- 2026-04-25
- Facts verified
- 2026-10-15