#RPGaDAY2021 Day 9 Medium

It's a Monstrous Monday and it is also Medium day for the #RPGaDAY. 

Day 9 Medium

Most of my monsters in the various Basic Bestiary are Medium-sized.  This works out well for a number of reasons, but mostly it is a boon for something I had been wanting to do for a while.

In D&D 5 monsters have different HD die types depending on their size.  It works out like this.

Table: Size Categories

Size	Space	Hit Die
Tiny	2½ by 2½ ft.	d4
Small	5 by 5 ft.	d6
Medium	5 by 5 ft.	d8
Large	10 by 10 ft.	d10
Huge	15 by 15 ft.	d12
Gargantuan	20 by 20 ft. or larger	d20

So Medium monsters use the common d8 for hit dice and the truly monstrous Gargantuan creature gets a d20.  While AD&D and Basic D&D went more for larger creatures having more HD this works for what I call the giant baby problem.  A gigantic creature can have a lot of hit points, but no combat ability, two things that HD covers. 

I also like this idea for personal reasons.  When I moved from Basic D&D to Advanced D&D I often used a d10 for monster hit points and not the RAW d8.  I figured the monsters had to be more "advanced" so they got more hp.  I also rationalized this with the fact that Basic fighters use d8 for hp, and Advanced fighters used d10.  Of course on average, this is only 1 extra point per HD, but I liked it all the same.

3e and 4e also used different die types for hit dice, but these were different for different types of monsters.  I like the 5e way of using these for size. 

You might have seen these in some of my write-ups.  The Mad Hatter Goblin is a small creature. I list it's standard HD is 2 and it's average hp from a d8 and it's Con mod is 9 +2 or 11.  As a small creature, the same 2 HD and +2 con mod gives the creature an average hp of 7 +2 or 9.   Sure not a lot of difference, but enough over the long run. 

I am presenting both sets for people that want to use my "Advanced" set of size-based hp calculations or the standard RAW ones.   I have been using this for a while now and while there might not be a significant difference in the play of the vast majority of monsters, the ones it does affect really affects them.

I hope people, especially in the OSR crowds, take to the change.