Size and Reach

This game is meant to be played on a grid of hexes or squares. Personally I prefer hexes. Creatures must be represented in such a space. That's why creatures are broken up into size categories. See picture below chart for references. Size comes with a handful of other features as well.

Size	Space	Reach	Description
Tiny	1 space	0 ft	Typical for fairies and pets like cats. Tiny creatures are usually around 1 ft tall and weight <10 lbs
Small	1 space	5 ft	Typical for goblins and common animals like dogs. Small creatures are usually around 3ft tall and weigh around 30 lbs
Medium	1 space	5 ft	Most common size for creatures in general. Medium creatures are usually around 6 ft tall and weigh around 150 lbs.
Large	~3 spaces	10 ft	Common size for monsters like giants. Large creatures are usually around 10 ft tall and weight around 600 lbs
Huge	~7 spaces	15 ft	Enormous monsters like dragons fit here. Huge creatures are usually around 15 ft tall and weigh around 3k lbs.	Gain resistance to poise damage from minion creatures. Minion creatures cannot poise break huge creatures.
Massive	10+ spaces	20 ft+	Massive creatures are terrifying monstrosities like kaiju and dinosaurs. Massive creatures are over 20 ft tall and weigh tons.	Gain resistance to poise damage from creatures with 3 or less strength. Such creatures cannot poise break massive creatures.

Creatures threaten all spaces they occupy by default.

You can enter the space of a creature that is a size category larger or smaller than you. If you leave a space occupied by a creature, it provokes an AoO as though you were leaving a threatened area. If you get attacked this way, the same creature can't also AoO you for leaving their threatened square in the same turn.