Shades of Eternity
Legend
I couldn't resist. I worked under the assumption that the one eyed, one horned, winged purple people eater is the adult form of the purple worm. Enjoy. 

Skills are easy enough to add. which instrument should you give them?Doesn't seem to be playing rock and roll out of it's horn...
inor point is that when calculating average damage in 5E, we traditionally take the die size halved plus .5 to get the true average for one die, add all the dice and static bonuses up, and then round down to the nearest whole number. For instance 3d12 + 7 is 6.5 x 3 = 19.5. 19.5 + 7 = 26.5. Rounded down to a whole number of hitpoints is 26. Basically, formulas with odd numbers of dice are averaged
Don't you mean Alarums & Excursions? There certainly was one in A&E #10, which only ate... purple people.I seem to remember a take on the Purple People Eater in White Dwarf in the 80s.
Never read that, so no.Don't you mean Alarums & Excursions? There certainly was one in A&E #10, which only ate... purple people.
What are you trying to ask in this question. There is only one way to calculate HP it is as @Uta-napishti stated. However, CR does have an "effective" HP (and AC and to hit bonus for that matter). Is that what your talking about? The "effective" HP is simple the calculated HP + an features that modify the HP total for the purposes of CR calculation only (like Legendary Resistance)so which hp for the cr?