GM Rule: Beastiary Additions

I know it's spelt bestiary, idc. It helps searching for it.
 
Threat Level Average HP Range Average Base AC range (10 + TL, plus or minus 2 with certain modifiers. Does not include Att.) Prof. Bonus (= 1/2 TL) Attack Bonus / Save DC (= 10 + Proficiency. Does not Att.) DPR (Damage per round)
-1 5-9 8-13 -1 +2 1
0 11-20 10-14 +0
0.5 14-26 10-14 +1
1 17-32 10-15 +1
2 21-41 11-15 +2
3 31-53 12-16 +2
4 42-72 12-17 +3
5 53-97 13-17 +4
6 x-y 14-18 +4
7 x-y 15-19 +4
8 x-y 15-20 +4
9 x-y 16-20 +4
10 x-y 17-21 +4

 

Health and Effective Health


 
Creature Type Hit Dice + Extra Additional Notes
Aeon 1d12
Beast 1d8
Class Levels or Templates varies (see classes or templates)
Celestial 1d10
Construct 1d10
Demon 1d10
Devil 1d12
Divine 1d20
Dragon 1d12 Often larger than normal, gaining DR and extra health from Size mods
Elemental 1d12
Fey 1d10
Humanoid 1d8
Monstrosity 1d10
Mythical Beast 1d10
Ooze 4d10, -2 Base AC Often cannot be crit except by certain damage types
Plant 1d10, -2 AC
Plant 1d10
Titan 1d12 Often larger than normal, gaining DR and extra health from Size mods
Seraph 1d12
Undead 1d8

  Monster health calc = (Creature HD + Template/Class HD+ Size Mod + Con)*TL, min 1 + (TL * 10, rounded up)) + Other + Rank Modifier (Minion, Normal, Elite, etc). Not all index entries will follow this formula, but it is a good rule of thumb.
 
Creature Size
Diminuitive and Smaller -15 ft of movement and HD reduced one step, +8 AC
Tiny -10 ft of movement and HD reduced one step, +4 AC
Small -5 ft of movement or HD reduced one step, +2 AC
Medium Normal
Large x2 HD formula, DR/all = to TL +2
Huge x2 HD formula, 2x AHP formula, DR/all = to TL +4
Gargantuan x2 HD formula, 3x AHP formula, DR/all = to TL +6
Colossal x4 HD formula, 2x AHP formula, DR/all = to TL +8
Titanic (Base) x4 HD formula, 3x AHP formula, DR/all = to TL +10
Titanic (Diminutive) x4 HD formula, 4x AHP formula, DR/all = to TL +12
Titanic (Tiny) x8 HD formula, 4x AHP formula, DR/all = to TL +14

  So on and so forth. Sizes continue, From Titanic, to Mega, Giga, Tera, Exa, and Macro.
  Creature sizes seldom get past Titanic, but the classification and scaling is here for the sake it and to include entities (such as deities, elder monstrosities, and all in between) who may get to that point. The extra size categories are inspired by Craig Conchrane's Immortals Handbook, Acension (here) and their Immortals Handbook Beastiary (here). Nothing else from the book is used in this system, though it may give ideas for extremely large, kaiju-eseque creatures GMs may want to throw their characters at. Also of note: You technically can make creatures of unusual size (such as a Titanic-sized Cat. That does not mean you should.
 

Credits

    • This Reddit thread by /u/Gen085 has been a helpful for understanding Monster Scaling and CR. Although unknown, it's been an invaluable source for years and reminds me of 4e's monster scaling. Such went into CHASE's monster design.

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