For 9Dragon players,I thought it might be a good idea to make a list. This could be handy for those that get some tomes drops and don't know what they got, and whether to npc it or sell it.If you are interested in it .just look through.Hopefully the article can help you. I believe you will learn something from it.

To not make the list excessively long, I'd prefer it to me minized down to the most important ones;

Healer: str/dex, con/ess, def buff, quick heal(uses for hybrid too)
Hybrid: +all stat, con/def/dmg
Nuker: wis (uses for healer too), def, 599 shield, ve shield, gb shield,
Warrior: dmg (the first one to be learned)

BOT

Healer:
Armored Art of Yellow
Armored Art of Body
Greater Healing of Iron

Hybrid:
Armored Art of Power
Protection of 9 dragons gold

Nuker:
Armored Art of White Wolf
Armored Art of Phoenix
Armored Art of Light
Armored Art of Black Wolf
Armored Art of Blue Wolf

Warrior:
Basic Conquerer's Art

HD

Healer:
Demonic Healing of Yama
Demonic Protection of White
Demonic Protection of Hell
Demonic Protection of Blue

Hybrid:
Demonic Healing of Blood The Sky
Demonic Madness of Spirit

Warrior:
Demonic Confucion of Darkness

Nuker:
Demonic Protection of Infinity
Demonic Protecion of Jade
Demonic Protection of Asura
Demonic Protection of Blue
Demonic Protection of Black

SF

Healer:
Summoning Spirit of Tortoise
Summoning Spirit of Mistress
Summoning Spirit of Red Snake
Mistress Art of Healing

Hybrid:
Summoning Spirit of Fire Ghost
Heavenly Spirit of Lost Souls

Warrior:
Enchanting Spirit of Luck

Nuker:
Summoning Spirit of Orchid
Summoning Spirit of Blue Jade
Summoning Spirit of Green Jade
Summoning Spirit of Hell
Summoning Spirit of Black Jade

WT

Healer:
Fortitude Art of Spirit
Fortitude Art of Body
Fortitude Art of Blue

Hybrid:
Hermit Healing of Fire
Light Art of Tea

Hermit Healing of Yang

Warrior:
Xuanxu Art of Earth

Nuker:
Greater Fortitude Art of Azure

Fortitude Art of Invincibility