Remember with each suggestion I make it is based off of "how much the spell would be used", obviously every single spell/skill has specific cases in which they could be used, but only in those limited cases are they even remotely effective; in those cases I recommend using scrolls and saving precious skill points. For the other spells that are useful enough that you will not be able to craft/own enough scrolls, investment comes into play...
NOTE
With a 3-4 in a specific skill you can learn 6 novice skills, if there are < or = (less than or equal to) 6 skills total you can learn them all and thus listing all six skills would be redundant. (<6 simply means that you can learn them all.) If you can learn 6 skills and there are 7 skills total in the game, instead of listing all six skills that you should learn I simply state which skill(s) to NOT learn in some cases for simplification.
Level 1 Air (Ranger, Leadership Knight)
Teleportation (Both)
Thunder Jump (Leadership Knight)
Wind of Change (Leadership Knight)
Blitz Bolt (Ranger)
Bitter Cold (Ranger)
Level 4 Air (Dual Wielding, Shadowblade)
NOVICE
Don’t take Avatar of Storms
ADEPT
Don’t take Air Absorption
MASTER
Storm
Chain Lightning/Netherswap Required lv 12
Storm/Make Invisible Required lv 15
EARTH MAGIC
Level 1 Earth (Ranger, Leadership Knight, Dual Wielding, Shadowblade)
Boulder Bash (All)
Midnight Oil (All)
Summon Spider (All)
Summon Slug/Deadly Spores Required lv 12
Earthquake/Summon Earth Elemental Required lv 15
FIRE MAGIC
Level 1 Fire (Ranger, Dual Wielding, Shadowblade)
Firefly (Dual Wielding, Shadowblade)
Burning Touch (Dual Wielding, Shadowblade)
Wildfire (ALL)
Flare (Ranger)
Burn My Eyes (Ranger)
Immolation Required lv 12
Infectious Flame/Meteor Shower Required lv 15
WATER MAGIC
Level 4 Water (Dual Wielding, Shadowblade, Ranger)
NOVICE
<6
ADEPT
Don’t take Waters of Life, Water Absorption, or Ice Wall
MASTER
Hail Attack
Mass Disease Required lv 12
Hail Attack/Winterblast/MassHeal Required lv 15
WITCHCRAFT MAGIC
Level 2 Witchcraft (Dual Wielding, Shadowblade)
NOVICE
Don’t take Summon Undead Warrior and Malediction
ADEPT
Summon Undead Armored Decapitator
Destroy Summon
Level 4 Witchcraft (Ranger)
NOVICE
<6
ADEPT
Drain Willpower
Rapture
Summon Undead Armored Decapitator
Destroy Summon
MASTER
Soul Sap
Soul Sap Required lv 12
Ressurect/Death Punch/Invunerability Required lv 15
MAN-AT-ARMS SKILLS
Level 1 Man-at-Arms (Shadowblade)
Battering Ram
Helping Hand
Melee Power Stance
Level 3 Man-at-Arms (Dual Wielding)
NOVICE
Don’t get Melee Defensive Stance or Divine Light
ADEPT
Rage
Crippling Blow
Whirlwind
Level 5 Man-at-Arms (Leadership Knight)
NOVICE
Don’t get Melee Defensive Stance or Divine Light
ADEPT
Don’t get Barbed Wire or Elemental Tortoise
MASTER
Flurry
Shackles of Pain
Flurry Required lv 12
Shackles of Pain Required lv 15
EXPERT MARKSMAN SKILLS
Level 5 Expert Marksman (Ranger)
NOVICE
Don’t take Ranged Precision Stance
ADEPT
Farseer
Barrage
Vampiric Arrow
*Whatever*
MASTER
Rain of Arrows
Arrow Spray
Arrow Spray/Shrapnel Required lv 12
Rain of Arrows Required lv 15
SCOUNDREL SKILLS
Level 1 Scoundrel (Ranger, Leadership Knight)
Walk-in-Shadows
Hover Feet (aka Winged Feet)
Fast Track (pre level 15) Adrenaline (post level 15)
Level 3 Scoundrel (Dual Wielding)
NOVICE
Fast Track (pre level 15) Adrenaline (post level 15)
Walk-in-Shadows
Winged Feet (aka Hover Feet)
Precise Incision
Lacerate
Venomous Strike
ADEPT
Eye Gouge
Daggers Drawn
Cloak and Dagger
Level 4 Scoundrel (Shadowblade)
NOVICE
Fast Track (pre level 15) Adrenaline (post level 15)
Walk-in-Shadows
Winged Feet (aka Hover Feet)
Precise Incision
Lacerate
Venomous Strike
ADEPT
Eye Gouge
Daggers Drawn
Become Air
Cloak and Dagger
MASTER
Shadow Step
Crawling Infestation Required lv 12
Coup de Grace/ShadowStep Required lv 15