A comprehensive source of information about various mechanics in Dominions 5 can be found in its online manual. A brief overview can be found below:

• Dominions Random Number (DRN) (Dice roll mechanic)
• Province attributes
  • Terrain types
  • Population
  • Income
  • Resources
  • Recruitments
  • Dominion
  • Unrest
  • Supplies
  • Defense
  • Corpses
  • Scales
  • Province defense
• Buildings and Sites
  • Forts
  • Temples
  • Laboratories
  • Magic Sites
• Mercenaries
• Scouting and Scrying
• Units attributes
  • Standards
  • Special abilities
  • Units classes (Magic being, Mindless,…)
  • Experience points
  • Heroic abilities
  • Afflictions
  • Recruitment costs
  • Recruitment restriction
  • Upkeep
  • Age
• Army management
  • Battle orders
  • Battle position
  • Squads
• Map Movement rules
• Map Orders (Patrol, Blood hunt, etc…)
• Turn resolution sequence
• Combat
  • Battle sequence
  • Formations
  • Battlefield movement
  • Melee combat
    • Hit location
    • Shield destruction
    • Weapon types effects
    • Fatigue
    • Repel
    • Harassment
    • Multiple attack
    • Multiple weapons
  • Missile Combat
  • Damage type (Cold, Fire, Bleeding, Poison, etc..)
  • Afflictions
  • Morale and Routing
  • Retreats
• Sieges
• Magic
  • Access to Magic spells rules
  • Empowerment
  • Indirect Magic
  • Battle magic mechanics (interrupts, penetration, fatigue, gems)
  • Rituals
  • Global Enchantments (+dispel mechanic)
  • Communions
  • Alchemy
• Research