Shin Megami Tensei: Persona/Gameplay

Stats

 * St - Strength - Affects the strength of physical attacks
 * Vi - Vitality - Affects defensive ability and HP gains
 * Dx - Dexterity - Affects hit rate of sword and gun attacks
 * Ag - Agility - Affects evasion rate and turn order
 * Lu - Luck - Has a slight affect on various things

Spells
Spells have types and sub-types. Personas and demons have particular types and sub-types of spells that they may use, and some may use a secondary type in addition to their primary type. All combatants have strengths and weaknesses towards certain types and sub-types. Element and Force are opposing types, as are Holy and Dark. Fire and Ice, Earth and Wind, Electricity and Nuclear, and Gravity and Blast are opposing sub-types.