I can understand the concern but even without Hit Dice it's easy to replicate the randomness.
First Big Bads should have unique ability scores and items so there Con bonus is in question off the bat.
Second I would just tell my players that just like in 3.5 there was a given number of hit points for each monster. Don't count on it though, I as the DM like to mix things up a bit and will use a random number of hit points for some monsters.
Easy way to make a random number if you want is subtract a number from the given hit points and roll some dice to fill in the difference. Bascily subtract a number 4, 6,8, 10, 12, or 20 based on how many HP it normaly has then roll 2 dice of that type and add.
Example.
Monster X has 28 hit points listed...subtract 6 to get 22+(2d6)= 24-36 hit point range, not far off from the base 28 so shouldn't effect the CR (or whatever it's called now) but keeps the players guessing.
But honesty for most mass battles it's just as easy to use the listed HP on the monster, it's what I think mostly gets done now with the average HP listed in the MM's anyway.
First Big Bads should have unique ability scores and items so there Con bonus is in question off the bat.
Second I would just tell my players that just like in 3.5 there was a given number of hit points for each monster. Don't count on it though, I as the DM like to mix things up a bit and will use a random number of hit points for some monsters.
Easy way to make a random number if you want is subtract a number from the given hit points and roll some dice to fill in the difference. Bascily subtract a number 4, 6,8, 10, 12, or 20 based on how many HP it normaly has then roll 2 dice of that type and add.
Example.
Monster X has 28 hit points listed...subtract 6 to get 22+(2d6)= 24-36 hit point range, not far off from the base 28 so shouldn't effect the CR (or whatever it's called now) but keeps the players guessing.
But honesty for most mass battles it's just as easy to use the listed HP on the monster, it's what I think mostly gets done now with the average HP listed in the MM's anyway.
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