Grimrock

Air Spells

Name: Shock
Reqs: Air Magic 1
Sign: Air
Info: Conjures a blast of electricity that deals shock damage to all foes directly in front of you.

Name: Invisibility
Reqs: Air Magic 3, Concentration 2
Sign: Air, Physicality, Balance, Death
Info: Turns yourself and your friends invisible.

Name: Shock Shield
Reqs: Air Magic 3, Concentration 3
Sign: Balance, Life, Air, Physicality, Balance
Info: Creates a magical shield reducing shock damage against the party.

Name: Lightning Bolt
Reqs: Air Magic 4
Sign: Spirituality, Balance, Life, Air
Info: You channel the power of storms through your hands.

Earth Spells

Name: Poison Cloud
Reqs: Earth Magic 1
Sign: Earth
Info: Summon a toxic cloud of poison that deals damage over time.

Name: Poison Bolt
Reqs: Earth Magic 2
Sign: Earth, Death, Ice, Physicality, Air
Info: A sizzling venomous bolt of poison shoots from your hands.

Name: Poison Shield
Reqs: Earth Magic 3, Concentration 3
Sign: Balance, Death, Earth, Spirituality, Balance
Info: Creates a magical shield reducing poison damage against the party.

Fire Spells

Name: Fireburst
Reqs: Fire Magic 1
Sign: Fire
Info: Conjures a blast of fire that deals fire damage to all foes directly in front of you.

Name: Fireball
Reqs: Fire Magic 3, Air Magic 1
Sign: Fire, Life, Air, Physicality
Info: A flaming ball of fire shoots from your fingertips causing devastating damage to your foes.

Name: Fireshield
Reqs: Fire Magic 3, Concentration 3
Sign: Balance, Life, Fire, Spirituality, Balance
Info: Creates a magical shield reducing fire damage against the party

Name: Meteor Storm
Reqs: Fire Magic 3, Air Magic 3
Sign: Fire, Spirituality, Balance, Physicality, Air
Info: Unleashes a devastating storm of meteors on your foes.

Water Spells

Name: Ice Shards
Reqs: Water Magic 1, Earth Magic 1
Sign: Earth, Death, Ice
Info: Deathly sharp spikes of ice thrust from the ground hitting your opponents in a line. Every point in Water Magic increases the spell's range by one.

Name: Dispel
Reqs: Water Magic 1, Concentration 1
Sign: Fire, Life, Air, Physicality, Balance, Spirituality, Earth, Death, Ice
Info: Shoots a ray that damages elementals.

Name: Frostbolt
Reqs: Water Magic 3, Air Magic 1
Sign: Air, Physicality, Ice
Info: You hurl a bolt of ice death dealing ranged damage and freezing your opponents. Every point in Water Magic increases the probability and duration of the freezing effect.

Name: Frost Shield
Reqs: Water Magic 3, Concentration 3
Sign: Balance, Death, Ice, Physicality, Balance
Info: Creates a magical shield reducing cold damage against the party.

Utility Spells

Name: Shield
Reqs: Concentration 1
Sign: Spirituality, Balance, Protection
Info: Creates a magical shield around you. The shield protects from physical damage by increasing your Protection by 25. Every point in concentration skill increases spell's duration by 10 seconds.

Name: Darkness
Reqs: Concentration 2
Sign: Death, Balance
Info: Negates all magical and non-magical light sources carried by your party.

Name: Light
Reqs: Concentration 2
Sign: Light, Balance
Info: Conjures a dancing ball of light that illuminates your path.

Name: Force Field
Reqs: Concentration 2
Sign: Fire, Light, Air, Physicality, Ice, Death, Earth, Spirituality, Fire
Info: Creates a magical barrier that blocks all movement. Every point in Concentration increases spell's duration by 2 seconds.

Name: Darkbolt
Reqs: Concentration 3
Sign: Death, Balance, Spirituality
Info: Shoots a ray that engulfs the target in magical darkness.

Level 1 - Start with 1 point in Water and 1 point in Air. The point in Air will get you the Shock spell so you have an attack spell right off the bat.
Level 2 - Put a second point in Water. (No immediate effect)
Level 3 - Put a third point in Water. This will allow you to cast Frostbolt at the earliest possible time.
Level 4 - Put a point in Concentration to unlock both Shield and Dispel.
Level 5 - Put a second point in Concentration to unlock Darkness, Light, and Force Field.
Level 6 - Put a point in Earth to unlock both Poison Cloud and Ice Shards.
Level 7 - Put a second point in Air. (No immediate effect)
Level 8 - Put a third point in Air to unlock Invisibility.
Level 9 - Put a third point in Concentration to unlock Darkbolt, Frost Shield, and Shock Shield.
Level 10 - Put a fourth point in Air to unlock Lightning Bolt.
Level 11+ whatever you like

You can forego the point in Earth at level 6 if you want to get Invisibility at level 7 instead of 8, but you delay (or miss out on) both Poison Cloud and Ice Shards to do so.

A Human can get Invisibility by level 6 by starting with an extra point in Concentration, but they still can't get Frostbolt before level 3.