Equipment Modifiers apply different stats to items.
Might: Applies to the Glintstone Aegis, it increases Dodge.
Lethality: Applies to all equipment types, Increases Damage and Crit. (This is the best)
Warfare: Applies to all equipment types, Increases Damage and Armor.
Poise: Mostly applies to items with INT primary stat. Increases Dodge and Damage.
Brutality: Mostly applies to items with INT or DEX primary stat. Increases Damage and STR.
Force: Mostly applies to items with INT or DEX primary stat. Increases Crit and STR.
Security: Mostly applies to items with INT or DEX primary stat. Increases Armor and STR.
Fatality: Mostly applies to items with INT or STR primary stat. Increases Crit and DEX.
Assault: Mostly applies to items with INT or STR primary stat. Increases Damage and DEX.
Riposte: Mostly applies to items with DEX or STR primary stat (needs confirmation). Increases Crit and Dodge.
Prowess: Mostly applies to items with DEX or STR primary stat (needs confirmation). Increases Crit and Armor.
Potency: Mostly applies to items with DEX or STR primary stat. Increases Damage and INT.
Tactics: Mostly applies to items with DEX or STR primary stat. Increases Crit and INT.
Will: Mostly applies to items with DEX or STR primary stat. Increases Armsor and INT.
Savvy: Mostly applies to items with DEX or STR primary stat. Increases Dodge and INT.