Stacking Modifier Reference
https://obelisk.daerma.com/topic/235/stacking-modifiers

Cat…Bonus Name…Affects…How the Bonus happens

Property
…Alchemical…Material prop…Chemical/Magical process
…Enhancement…Material prop…Craft or Magical Enhance
…Size…Physical prop…Self Explan
…Inherent…Ability Scores…Magical Enhance
…Resistance…Usually Saves…Nat. or Mag. Enhance

Protect
…Natural Armor…AC (block)…Physical barrier
…Armor…AC (block)…Physical barrier
…Shield…Usually AC (block)…Physical barrier
…Deflection…Usually AC (touch)…Change/Redirect Motion
…Dodge…Usually AC (touch)…Speed/Agility/Skill

Skill
…Racial…Usually Actions…Natural Enhance
…Morale…Actions…Emotional State
…Competence…Actions…Knowledge
…Insight…Almost anything…Knowledge
…Epic…Almost anything…Knowledge/Skill

Other
…Luck…Almost anything…Self Explan
…Divine…Almost anything…Divine Intervention
…Perfection…Almost anything…Various
…Circumstance…Almost anything…Various

Align
…Profane…Almost anything…Various Evil
…Sacred…Almost anything…Various Good