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Message: <blockquote data-quote="NotAYakk" data-source="post: 7854354" data-attributes="member: 72555">I haven't seen you do any correlation math, so I assume you are using correlation in the "not the math word" way.First, I said association.  Second, [citation needed].  Of course there is a correlation there -- as one varies so does the other.I described what the association is between 1e HD and 5e CR.  They are both used as a measure of monster difficulty.  5e HD is not used as a measure of monster difficulty.I believe HD correlates with damage, because I know HD correlates with HP (as it is derived from HP, and monster size, and monster con bonus), and HP correlates with CR, and CR correlates with Damage.  But starting with HD is frankly ridiculous given how the DMG describes how to build monsters.Possibly the monsters in the MM where not built using the method described in the DMG.  But it sure looks like they where.  Kobolds have 2 HD not because someone thought "Kobolds should have 2 HD", but because they are small (so their HD are d6s), and because they wanted them to have [g]negative con[/b] and about 5 HP.  So 5/(3.5-1) = 2, so they have 2 HD.They are CR 1/8, so they have a proficiency bonus of +2.  They use Dex to attack, and they should be Dexterous -- but not too far, they are low-CR monsters.  So 15 Dex (+2).  From that you get an attack bonus of +4.Given that attack bonus and a target low-CR, they get 1d4 damage weapons.  So they hit for 1d4+2 at +4 to hit.  This gives you an offensive CR.AC wise, with 15 dex they have 12 AC.  There isn't an obvious reason to penalize this; you could give them a bonus, but we'll pass.From 12 AC and 5 HP you get a defensive CR, from +4 ATK and 1d4+2 damage you get an offensive CR, you average them and you get a CR of 1/8.  This matches the designers concept of a weak humanoid foe!Do the same with an orc, and because they are medium (d8 HD) and the concept has them with high constitution (+2) for a low-CR monster, and HP in the 10 to 20 range, we get (10 to 20) / (4.5+2) is 2ish or 3ish HD.  Etc.Make a creature that is identical to an orc, but small and has -1 con, and it has 6 HD.  Its attack bonus and HP and CR remain unchanged (moving con from +2 to -1 isn't a large enough change to trigger a CR change likely).The reason why HD correlates is that the other stuff -- size, con, etc -- is semi-random, if slightly increasing with monster CR, and CR is how tough a monster is, and how tough a monster is in 5e correlates with how tough it is in 1e.</blockquote>

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