Sadly, I just read the 5e hard core book.
For the Horde!!!
Had to say that when talking horde stuff, just too ingrained even 10+ years later.
Being that I love my players or characters to occasionally wade down the enemy like a scythe to wheat…this was quickly recognizable.
Decide how many HP your Enemy will have, for hordes, 1~5 seems appropriate, that is the constant. But you don’t track individual hordes HP, just their number.
So if your constant is 1, and the fighter hits for 4 damage, 4 of the horde go away…
If we are now fighting Imps as opposed to Skeletons…the imps might be 3…so the fighter would only have dispatched 1, and the 10 points from a fireball will dispatch 3 unless the imps are immune to fire based spells or take half damage from them…at half damage, only one imp dies…10 x 0.5 damage (because damage resistance) x 0.333 (because constant of 3)= 1.665…the .665 has no relevance. So 1.
I hope that helped???
It’s really simple once you do it 3 or 4 times. But it’s not what you might be used to, this is an abstraction used in mas combat games.