sorry for ugly formatting (anyone knows how to keep the tabs or make tables?)
Feel free to discuss:
Disarm:
Opponents cannot be disarmed of a shield or of natural weapons (such as claws). Opponents have a +2 bonus to their saving throw if they are wielding a two-handed weapon. Opponents have a +2 bonus to their saving throw if they are larger than the attacker or a -2 penalty if they are smaller.
Knock Down
Opponents have a +2 bonus to their saving throws is they have no legs (such as snakes or worms), have more than two legs (such as centipedes) or if they are otherwise exceptionally sure-footed or stable. Opponents have a +2 bonus to their saving throw if they are larger than the attacker or a -2 penalty if they are smaller.
Creature Size:
Creatures are of small, medium, or large size according to the following table:
Monster 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 L
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 L
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 L
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
Combat & Size
A creature has a +1 bonus 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. A creature has a -1 penalty to AC and attack throws if it is attacked by or attacks an opponent who is one size smaller or a -2 penalty to AC and attack throws if it is attacked by or attacks an opponent who is two sizes smaller.
Armor & Size
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 armor made for small creatures has its cost and weight halved, while armor made for large creatures has cost and weight doubled.
Weapons & Size
These optional rules introduce some simple guidelines for using weapons of various sizes. Sooner or later, a player may ask the game master if his adventurer can use a certain weapon with one or two hands or use it at all. Although game masters are encouraged to use ad-hoc rulings and stick to them, some may want a more official ruling. ACKS Weapon Size rules:
A creature can use all weapons listed under the creature’s size. It can also use one-handed melee (but not ranged or two-handed melee) weapons made for creatures of up to one size larger than its own size, but must use them two-handed. It can also use two-handed weapons made for creatures of up to one size smaller than its own size, but must use them one-handed.
[For small creature’s weapons, weapon damage is reduced by one die type step. For large creature’s weapons, weapon damage is increased by one die type step. Weapon cost and weight modifiers because of size can be neglected. If you need a ruling, assume that weapons made for small creatures has its cost and weight halved, while weapons made for large creatures has cost and weight doubled.]
The following table has already done that work for you and expands the ACKS Weapon Table, listing weapon-equivalencies of weapons made for smaller and larger than man-sized (medium) creatures.
Creature’s Size
Weapons Small Medium Large
Axes:
Battle Axe 1d4/1d6 1d6/1d8 1d8/1d10
Great Axe (2-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)* 2d6 3d6 4d6
Heavy Catapult (1,200lb)* 3d6 4d6 5d6
Light Catapult (1,800lb)* 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 (2-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 (2-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 (2-ha.) 1d8 1d10 1d12
Other Weapons:
Bola 1 1d2 1d3
Darts (5) 1d3 1d4 1d6
Net - - -
Sling with 30 Bullets 1d3 1d4 1d6
Sap 1d3 1d4 1d6
Staff (2-handed) 1d4 1d6 1d8
Whip 1 1d2 1d3
- 50% for small, 150% for large
Consequences of Using Size
==========================
Magic Armor and Weapons: using these optional rule may have an impact on magic armors and weapons, because some armors and weapons cannot be used by adventures because of their size. There are two options for the game master to choose and settle: 1) the game master decides, that such an item can simply not be used and thus is only good for cash or 2) the game master 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.