Crompox
15
Obviously I don’t know for sure, but one would guess that they were low level thralls?
Honestly a lot of my thralls would struggle solo also, to be fair, but then I don’t min-max, and I very rarely use legendaries, all depends on how you play.
In fact, a while back I lost a Dalinisa Snowhunter I was levelling up to the very same Rhino. I thought it had been despawned since the area had been built up quite heavily, so ran right through , and my thrall died almost instantly
(Dalinsia was only level 12 ) - The Rhino was not gone, just invisible 