Dwarf Fortress Bug Tracker - Dwarf Fortress
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0005511Dwarf FortressUndeathpublic2012-02-29 06:372014-07-09 11:28
Toady One 
0005511: Undead/zombies/reanimated survive magma and fire indefinitely
This was tested in the arena by exposing animated corpses to magma. The burning test subjects (dwarfs) survived 20 minutes at a frame rate of around 5000 FPS even when completely submerged in magma.

The undead took some initial damage when first forced into contact with the magma, but did not deteriorate any further.
Set an undead creature on fire
fire, magma, undead, Undeath
related to 0000033resolved Toady One Bronze colossus, skeletal creatures, fleshballs, and others are impossible to kill 
related to 0000307new  No announcements for blistering/charring, and other fire-related problems 
has duplicate 0005559resolved Footkerchief Zombies don't die in magma 
Issue History
2012-02-29 06:37RaskNew Issue
2012-02-29 06:38RaskTag Attached: fire
2012-02-29 06:38RaskTag Attached: magma
2012-02-29 06:38RaskTag Attached: undead
2012-02-29 06:38RaskTag Attached: Undeath
2012-02-29 08:23FootkerchiefSummaryUndead survive magma and fire indefinitely => Undead/zombies/reanimated survive magma and fire indefinitely
2012-02-29 08:23FootkerchiefRelationship addedrelated to 0000033
2012-03-06 07:38FootkerchiefRelationship addedhas duplicate 0005559
2012-03-29 02:27AlumineNote Added: 0021852
2012-03-31 09:14thvazNote Added: 0021949
2012-05-15 08:57FootkerchiefRelationship addedrelated to 0000307
2013-04-09 06:32KijiroNote Added: 0023920
2014-07-09 10:55TrifNote Added: 0025353
2014-07-09 11:28FootkerchiefNote Added: 0025359
2014-07-09 11:28FootkerchiefStatusnew => resolved
2014-07-09 11:28FootkerchiefFixed in Version => 0.40.01
2014-07-09 11:28FootkerchiefResolutionopen => fixed
2014-07-09 11:28FootkerchiefAssigned To => Toady One

2012-03-29 02:27   
I can confirm this.
2012-03-31 09:14   
I can confirm this. Human completely disappear after some seconds, human corpses stand around a long time.
2013-04-09 06:32   
I can confirm this in version 34.11. I thought dumping zombies/reanimated corpses into a volcano would be a great trap, but they just sink to the bottom of the magma and stand there.
2014-07-09 10:55   
This has been fixed in 0.40.01. I did some arena testing with undead dwarfs and lava, and the undead properly burn to death now.
2014-07-09 11:28   
Thanks for testing!