Extension for Fantasy Grounds' 3.5 and Pathfinder rulesets that adds a effects for manipulating a character's size.

SIZE effect will modify a player's attack, ac, cmd, cmb, fly skill, stealth skill and damage dice on weapons. Additionally if the option is enabled it will modify the Space the occupied on the battle grid, and the Reach using a best guess.
ESIZE will modify a player's damage dice on weapons.

The 3.5 rules for size changes: http://www.d20srd.org/srd/combat/movementPositionAndDistance.htm#bigandLittleCreaturesInCombat
The Pathfinder rules for size changes: https://www.d20pfsrd.com/gamemastering/combat/space-reach-threatened-area-templates?/#Creature_Sizes
I'm using Paizo's FAQ on damage dice changes for both rulesets: https://paizo.com/paizo/faq/v5748nruor1fm#v5748eaic9t3f

(N) = Only numbers supported for value attribute

[bonus] = alchemical, armor, circumstance, competence, deflection, dodge, enhancement, insight, luck, morale, natural, profane, racial, resistance, sacred, shield, size
[range] = melee, ranged

Examples

• Enlarge Person; SIZE: 1 size, melee; STR: 2 size; DEX: -2 size
• Reduce Person; SIZE: -1 size, melee; STR: -2 size; DEX: 2 size
• Lead Blades; ESIZE: 1 size, melee
• Gravity Bow; ESIZE: 1 size, ranged

Source code can be found here: https://github.com/SoxMax/FG-Size-Changes
Contributors: @Lichtblitz