TEXT:  
   
  Version 1.3 by Chrisitan Selzam. This document is for free. Adventurer Conqueror King System ©Autarch and ACKSTM Autarch. Used without permission. No 
  challenge to copyrights or trademarks is intended. 
  Throughout the ACK CR, a creature’s size is mentioned several times 
  but no formalized rules are given. These optional rules are an 
  attempt to formulize the guidelines that are given throughout the 
  book. 
   
  Creatures are grouped into one of the three different size categories. 
  Of small (S) (smaller than man-sized; up to 5’ tall), medium (M) 
  (man-sized; between 6’ and 10’ tall), or large (L) (larger than 10’ tall). 
  The following table gives the size for all creatures found in ACKS CR: 
   
  Table 1: Monster Size 
  SZ 
  Ankheg 
  L 
  Ant, Giant 
  S 
  Ape, White 
  M 
  Baboon, Rock 
  S 
  Basilisk 
  M 
  Bat, Ordinary 
  S 
  Bat, Giant 
  S 
  Bat, Giant, Vampiric 
  S 
  Bear, Black 
  M 
  Bear, Cave 
  L 
  Bear, Polar 
  L 
  Bee, Giant, Killer 
  L 
  Beetle, Giant, Fire 
  S 
  Beetle, Giant, Bombardier 
  M 
  Beetle, Giant, Tiger 
  L 
  Black Pudding 
  S-L 
  Blink Dog 
  M 
  Boar, Ordinary 
  M 
  Boar, Giant 
  L 
  Boar, Giant, Shaggy 
  L 
  Bugbear 
  M 
  Caecilian 
  L 
  Camel 
  L 
  Carcass Scavenger 
  L 
  Cat, Large, Mountain Lion 
  M 
  Cat, Large, Panther 
  M 
  Cat, Large, Lion 
  L 
  Cat, Large, Tiger 
  L 
  Cat, Large, Sabre-tooth Tiger 
  L 
  Centaur 
  L 
  Centipede, Giant 
  S 
  Chimera 
  L 
  Cockatrice 
  S 
  Crab, Giant 
  L 
  Crocodile, Ordinary 
  L 
  Crocodile, Large 
  L 
  Crocodile, Giant 
  L 
  Cyclops 
  L 
  Demon Boar 
  L 
  Djinni 
  L 
  Dog, Hunting 
  S 
  Dog, War 
  M 
  Doppelganger 
  M 
  Dragon 
  L 
  Dragon Turtle 
  L 
  Dwarf 
  S 
  Efreeti 
  L 
  Elemental, Air 
  L 
  Elemental, Earth 
  L 
  Elemental, Fire 
  L 
  Elemental, Water 
  L 
  Elephant 
  L 
  Elf 
  M 
  Ettin 
  L 
  Faerie, Pixie 
  S 
  Faerie, Sprite 
  S 
  Fish, Giant, Catfish 
  L 
  Fish, Giant, Piranha 
  L 
  Fish, Giant, Rockfish 
  L 
  Fish, Giant, Sturgeon 
  L 
  Fly, Giant, Carnivorous 
  M 
  Gargoyle 
  M 
  Gelatinous Cube 
  L 
  Ghoul 
  M 
  Giant, Hill 
  L 
  Giant, Stone 
  L 
  Giant, Frost 
  L 
  Giant, Fire 
  L 
  Giant, Cloud 
  L 
  Giant, Storm 
  L 
  Gnoll 
  M 
  Gnome 
  S 
  Goblin 
  S 
  Golem, Amber 
  M 
  Golem, Bone 
  M 
  Golem, Bronze 
  L 
  Golem, Wood 
  L 
  Gorgon 
  L 
  Gray Ooze 
  M-L 
  Green Slime 
  S 
  Griffon 
  L 
  Halfling 
  S 
  Harpy 
  M 
  Hawk, Ordinary 
  S 
  Hawk, Giant 
  M 
  Hell Hound, Lesser 
  M 
  Hellhound, Greater 
  L 
  Herd Animals 
  S-L 
  Hippogriff 
  L 
  Hobgoblin 
  M 
  Horse, Light 
  L 
  Horse, Medium 
  L 
  Horse, Heavy 
  L 
  Hydra 
  L 
  Invisible Stalker 
  L 
  Kobold 
  S 
  Lamia 
  M 
  Lammasu 
  L 
  Leech, Giant 
  S-M 
  Lizard, Giant, Draco 
  L 
  Lizard, Giant, Gecko 
  L 
  Lizard, Giant, Horned Chameleon 
  L 
  Lizard, Giant, Tuatara 
  L 
  Lizardman 
  M 
  Locust, Cavern 
  S 
  Lycanthrope, Werebear 
  L 
  Lycanthrope, Wereboar 
  L 
  Lycanthrope, Wererat 
  S-M 
  Lycanthrope, Weretiger 
  L 
  Lycanthrope, Werewolf 
  M 
  
  Manticore 
  L 
  Mastodon 
  L 
  Medusa 
  M 
  Men, Berserker 
  M 
  Men, Brigand 
  M 
  Men, Pirate 
  M 
  Men, Merchant 
  M 
  Men, Nomad 
  M 
  Mermen 
  M 
  Minotaur 
  L 
  Morlock 
  M 
  Mule 
  L 
  Mummy 
  M 
  Neandethal 
  M 
  Nymph, Dryad 
  M 
  Nymph, Naiad 
  M 
  Ochre Jelly 
  M 
  Octopus, Giant 
  L 
  Ogre 
  M 
  Orc 
  M 
  Owl Bear 
  L 
  Pegasus 
  L 
  Phase Tiger 
  L 
  Pterodactyl, Pterodactyl 
  L 
  Pterodactyl, Pteranodon 
  L 
  Purple Worm 
  L 
  Remorhaz 
  L 
  Rhagodessa, Giant 
  M-L 
  Rhinoceros, Ordinary 
  L 
  Rhinoceros, Woolly 
  L 
  Roc, Small 
  L 
  Roc, Large 
  L 
  Roc, Giant 
  L 
  Rot Grub 
  S 
  Rust Monster 
  M 
  Salamander, Flame 
  M 
  Salamander, Frost 
  M 
  Scorpion, Giant 
  M 
  Sea Serpent 
  L 
  Shadow 
  M 
  Shark, Bull 
  M 
  Shark, Mako 
  M 
  Shark, Great White 
  L 
  Shrieker 
  S-L 
  Skeleton 
  S-L 
  Skittering Maw 
  L 
  Snake, Spitting Cobra 
  S 
  Snake, Pit Viper 
  S 
  Snake, Sea Snake 
  M 
  Snake, Giant, Python 
  L 
  Snake, Giant, Rattler 
  L 
  Spectre 
  M 
  Spider, Giant, Black Widow 
  L 
  Spider, Giant, Crab Spider 
  L 
  Spider, Giant, Tarantula 
  L 
  Squid, Giant 
  L 
  Statue, Animated, Crystal 
  M 
  Statue, Animated, Stone 
  L 
  Statue, Animated, Iron 
  L 
  Stegosaurus 
  L 
  Stirge 
  S 
  Swarm, Bat 
  S 
  Swarm, Insect 
  S 
  Swarm, Rat 
  S 
  Thoghrin 
  M 
  Titanothere 
  L 
  Toad, Giant 
  M 
  Treant 
  L 
  Triceratops 
  L 
  Troglodyte 
  M 
  Troll 
  L 
  Tyrannosaurus Rex 
  L 
  Unicorn 
  L 
  Vampire 
  M 
  Varmint, Giant, Ferret 
  S 
  Varmint, Giant, Rat 
  S 
  Whale, Killer 
  L 
  Whale, Narwhal 
  L 
  Whale, Sperm 
  L 
  Wight 
  M 
  Wolf, Ordinary 
  S 
  Wolf, Dire 
  M 
  Wraith 
  M 
  Wyvern 
  L 
  Yellow Mold 
  S-L 
  Zombie 
  M 
   
  A creature’s size affects combat as follows: 
   
  A creature has a +1 bonus to AC and attack throws if it is attacked by 
  or attacks an opponent who is one size larger or a +2 bonus to AC and 
  attack throws if it is attacked by or attacks an opponent who is two 
  sizes larger. 
   
  As mentioned in ACKS CR p.109-110 size affects an opponent’s saving 
  throw vs. paralysis made to resist a force back, overrun or wrestling 
  attempt using the example of ogre vs. men. Using this as the basis 
  you can use the following, formalized rules which are in addition to 
  above mentioned modifiers to AC and attack throws: 
   
  If the combatant is smaller than his opponent, opponents have a +4 
  bonus per size difference to their saving throw made to resist the 
  effects of a combat maneuver. 
   
  If the combatant is larger than his opponent, opponents have a -4 
  penalty per size difference to their saving throw made to resist the 
  effects of a combat maneuver. 
   
  Items are made for creatures of different sizes out of necessity. 
  Imagine a giant trying to sit down on a goblin’s chair or a kobold 
  trying to war an ogre’s armor… 
   
  However using size rules has a profound impact on magic armors and 
  weapons, because some armors and weapons cannot be used by 
  adventurers because of their size. There are two options for the 
  Judge to choose and settle: 1) the Judge decides, that such an item 
  can simply not be used and thus is only good for cash or 2) the Judge 
  can rule, that magic armor and weapons automatically change their 
  
  size to fit their wielder’s size. The second option is less punishing to 
  adventurers. 
   
  Creatures can only wear armor and use shields made for their size. 
  Adjustments to cost and weight because of size can be neglected. If 
  you need a ruling, assume that armors or shields from ACKS CR p.41 
  are made for medium creatures. Armors and shields made for small 
  creatures have cost and weight reduced by 25%. Armor and shields 
  made for large creatures have cost and weight increased by 25%. 
   
  Assuming that ACKS CR p.41 lists weapons made for and intended to 
  be used by medium creatures, we can extrapolate weapon statistics 
  for weapons made for and intended to be used by small and large 
  creatures. For weapons made for small creatures, weapon damage is 
  reduced by one die type step. For large creatures, weapon damage is 
  increased by one die type step. Table 2 lists all the weapons from 
  ACKS CR p.41 but differentiates between weapons made for different 
  creature sizes. 
   
  Modifiers to weapon cost and weight can be neglected. If you need a 
  ruling, however, you can use the following guidelines: Weapons 
  made for small creatures have cost and weight reduced by 25% and 
  weapons made for large creatures have cost and weight increased by 
  25%. 
   
  A creature can use all the weapons listed for its size. It can also use all 
  one-handed melee (but not ranged or two-handed melee) weapons 
  made for creatures of up to one size larger, but must use them two-
  handed. It can also use all two-handed melee weapons (but not one-
  handed melee or ranged) weapons made for creatures of one size 
  smaller, but must use them one-handed. All other weapons are too 
  small, too large, or too unwieldy to be used effectively. 
   
  Table 2: Weapons 
   
  Creature’s Size 
  Weapons 
  Small 
  Medium 
  Large 
  Axes: 
   
   
   
       Battle Axe  
  1d4/1d6 
  1d6/1d8 
  1d8/1d10 
       Great Axe (two-handed) 
  1d8 
  1d10 
  1d12 
       Hand Axe 
  1d4 
  1d6 
  1d8 
  Bows and Crossbows: 
   
   
   
       Arbalest 
  1d6 
  1d8 
  1d10 
       Crossbow 
  1d4 
  1d6 
  1d8 
       Composite Bow 
  1d4 
  1d6 
  1d8 
       Longbow  
  1d4 
  1d6 
  1d8 
       Shortbow 
  1d4 
  1d6 
  1d8 
  Catapults and Ballista: 
   
   
   
       Ballista               (1,800lb)1 
  2d6 
  3d6 
  4d6 
       Heavy Catapult (1,800lb)1 
  3d6 
  4d6 
  5d6 
       Light Catapult   (1,200lb)1 
  2d6 
  3d6 
  4d6 
  Flails, Hammers, and Maces: 
   
   
   
         Club 
  1d3 
  1d4 
  1d6 
         Flail 
  1d4/1d6 
  1d6/1d8 
  1d8/1d10 
         Mace 
  1d4/1d6 
  1d6/1d8 
  1d8/1d10 
         Morning Star (two-handed) 
  1d8 
  1d10 
  1d12 
         War Hammer  
  1d4/1d6 
  1d6/1d8 
  1d8/1d10 
  Spears and Pole Arms 
   
   
   
         Lance (mounted) 
  1d8 
  1d10 
  1d12 
         Javelin 
  1d4 
  1d6 
  1d8 
         Pole Arm (two-handed) 
  1d8 
  1d10 
  1d12 
         Spear 
  1d4/1d6 
  1d6/1d8 
  1d8/1d10 
  Swords and Daggers: 
   
   
   
         Dagger 
  1d3 
  1d4 
  1d6 
         Silver Dagger 
  1d3 
  1d4 
  1d6 
         Short Sword 
  1d3 
  1d6 
  1d8 
         Sword 
  1d4/1d6 
  1d6/1d8 
  1d8/1d10 
         Two-Handed Sword 
  1d8 
  1d10 
  1d12 
  Other Weapons: 
   
   
   
        Bola 
  1 
  1d2 
  1d3 
        Darts (5) 
  1d3 
  1d4 
  1d6 
        Net 
  - 
  - 
  - 
        Sling with 30 Sling Bullets 
  1d3 
  1d4 
  1d6 
        Sap 
  1d3 
  1d4 
  1d6 
        Staff (two-handed) 
  1d4 
  1d6 
  1d8 
        Whip 
  1 
  1d2 
  1d3 
  1 50% for small, 150% for large 
  
SOURCE: textdata/thevault/Adventurer Conqueror King/ACKS Supplemental/ACKS Creature Size.pdf