I logged on today and saw in the event log last night, I had 11 fighter thralls die, for no apparent reason. Just says my thralls died (not killed by another NPC). I guess I’d understand if they were crafters due to all the new bugs, but why fighters (I have not even used them lately)? Another person on my official server (1732) said they had 3 die last night.
We had a bizarre player death that took place right after the server reset. After looking through all the logs, we had nothing more than “Mina has died” twice.
The best that I can come up with is that perhaps when the server reset, the werehyena event happened or was provoked (night time), and the player was not properly flagged as disconnected / offline (she was offline at the time).
It’s a bit of a hypothesis stretch. But it’s the best that I can come up with. It may be something else tied to the werehyenas that your figher thrall experienced.
The only thing worse than dying to a known bug is dying to an UNKNOWN BUG. 
There are different iterations of the werehyenas with some being tougher than others. Originally none of them were “visible” to thralls so thralls would never attack them or fight back. This was mostly fixed but there is still one level of werehyena that apparently got missed in the fix and thralls cannot see or fight that particular one. So bad luck on the draw when the werehyena spawns and you can easily lose a lot of thralls if they’re out in the open.
I don’t know if this is what happened to you, just that it is possible.
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