I had the same thing happen to a chaos knight, although can't remember if the character was ever poisoned poisoned twice or not. There was no natural healing at all for at least 10000 turns (after which I quit the game), neither in the wilderness nor in a dungeon. No worms corruption, so it just might be a bug.

I've uploaded the character flag too.

I have also character suffering the issue. I don't think the PC has ever been poisoned, and doesn't have worms corruption. I waited about 4000 without generating any hp (run out of food then, so couldn't wait more).

Added the savegame.

Correction, the corruption that says something like "your body is in a constant state of decay, requiring a lot of will to stay up" does this. Not worms.

Completely stopping HP regeneration is too harsh. Perhaps the same effect as rotting armor would be better.

I think the effect of this corruption is fine.
By the time a character becomes affected by corruption he/she should have alternative ways to heal wounds.
If not, then find some. The Big Room comes to mind.

@Stingray1 how do you propose a chaos knight at ZERO TURNS deals with this? rerolling?

Chaos Knights are supposed to be a challenge, and have a lot of variability. Some corruptions are quite beneficial, while others are downright evil in their effect on play. A Chaos Knight dealing with this corruption faces the same problem (in terms of effect on the game's difficulty) as a Chaos Knight dealing with the Stiff Muscles corruption.

So yes, if someone chooses to play a Chaos Knight, gets this corruption as one of the starting corruptions, and doesn't want it to be that difficult, then they should reroll.

I agree. It's a very harmful corruption but not more harmful than others like stiff muscles, or (situationally) poison hands. Corruptions have always been scary, that's why we go out of our way to get SoCRs... and Chaos Knights are clearly a challenge, no one should play them expecting them to be easy.

Chaos knights being a challenge and rerolling are fair points, but I do think it's more punishing than stiff muscles. In the early game, I mean. Mid to late game, of course it is no longer so bad.

Personally I won't re-roll. I'll take up the challenge. Either a player chose to play a CK or the player randomly rolled one, so the way I see it he wanted a challenging game.

CKs start with pretty high PV. I would go straight to DDL and then the Big Room. For healing herbs.

I hope this thread doesn't turn into a CK survival discussion.

Hmmm.. the decay corruption only halves healing speed...

Yesterday I played a mist elven CK and there was a point in the game where health regeneration totally stopped. I went from the TotHK to the Barbarian clearing and I regenerated no HP at all. Then I went from the clearing to the ID, and regeneration worked as normal.

Sadly, I don't have a save that reflects this, but I don't think I even had the decay corruption.

Looking at comments, and at your response...

Is it possible that the decay corruption keeps halving healing speed, rather than just applying once? I could definitely see an accidental use of the current healing speed rather than the uncorrupted one in the statement telling it to halve healing speed.

EDIT: It could also explain why removing the corruption isn't undoing the effect, and thus why they're seeing it stopped even without the corruption currently happening. If you just double the current healing speed when removing the corruption, it would result in extremely slow healing, if it kept being halved first.

Or halving amount of healing every time you're healed, which is usually 1 at a time. And 1 halved is 0 (when calculating with integers).

No, I was not precise enough. Actually it doubles the time it takes to heal by causing normal healing to kick in only on every other turn.

And it's directly dependent on the corruption being active so there can't be any lingering effects.

That could explain it. Normal healing only restores hitpoints once in every so many turns, so if that happens to interfere badly there will be no healing. (For example, if you currently heal 1 HP every 4 turns naturally the corruption could negate it completely.)

Given the discussion above it seems like Thomas should decide if this needs to be marked as Not a Bug or not :)

I have randomized the slowdown due to decay a little bit in order to remove the (highly unlikely) probability of numeric interactions with other factors. Otherwise I won't change decay. If you are afraid of corruptions you probably might not want to play chaos knights - balance was never too much a topic in ADOM as far as classes are concerned - rather being able to rise up to challenges ;-)