32000 was probably the HP cap in the base game, so it is a good amount for something to do that is supposed to just one shot anything -- same reason all the Kunark dragons have 32k hp. This was almost certainly due to representing HP as a 16 bit signed integer, which allows for representing numbers between 2^15 -1 and -2^15, or 32767 max. It seems likely someone decided to cap at the nearest thousand and call it a day.
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