in 3e Hellboy Sourcebook and Roleplaying Game it was worth 1/2 if it was FP instead of HP which could not come back.
March 2007 http://forums.sjgames.com/showpost.php?p=376446&postcount=14 says that Unhealing prevents Reattachment for Independent Body Parts
April 2005 http://forums.sjgames.com/showpost.php?p=66415&postcount=6 with spinoff thread http://forums.sjgames.com/showthread.php?p=68722
- There's already a precedent set in GURPS that FP only is worth -50% on a disad, so I'd stick with that. -15 for Total and -10 for Partial. For the name, I'd honestly just stick with Unhealing (FP only, -50%), but I'm unromantic like that.
suggests FP instead is 0%, FP also is +100%, similar to Regeneration. This also came up in a 2013 post https://www.myth-weavers.com/showthread.php?t=208568
- Since 'No FP score' feature doesn't affect the ER, Unhealing should not affect VR. That's from the simplistic logic PoV. Though that seems munchkiny.
There was a 2017 thread discussing it https://web.archive.org/web/20180516020508/http://webcache.googleusercontent.com/search?q=cache:Mwjos9LV1_gJ:forums.sjgames.com/showthread.php%3Ft%3D153961%26page%3D2+&cd=1&hl=en&ct=clnk&gl=ca
The mods deleted it. Or perhaps hid it.