Upon release in 1989, Avalon was the first to create these online RPG game aspects:
- a sophisticated combat system[3] based on equilibrium and balance (cooldowns)
- player-run guilds and cities around which ideologies formed
- balanced professions with unique skills each with dozens of abilities
- skill-based PVP combat that favoured talent and skill over seniority
- player-run cities and government, with princes, barons, laws and economies[4]
- persistent world constantly accessible retaining character status, level, skills and inventories[5]
- gold and actual currency economics, player ownership of items, inventories and shops[6]
- personalised descriptions and customisation of one's own avatar
- afflictions by poisons, cures using herbs
- divinities that follow a Greco-Roman mandate of antagonising or helping mortaldom; they serve no administrative function whatsoever[7]
- Ordination: a series of major Gem Quests culminating in an elimination sequence until the last mortal remaining becomes a god or goddess[8]
- real allegiances of importance: guild, city, personal patron, guild and city patrons among the Pantheon of Olympus
- non-scripted narrative putting the direction of the world in the hands of the players, allowing them to permanently affect the world