Dear Crows, let me give you a quick overview on the PROTECTION Domain of Crowfall and which Major and Minor Disciplines they give you access to. If you want to check out what each Specialization Class brings to the table check out my Races and Classes Guide.
CREDIT: I want to thank Tinnis, who made an invaluable contribution by providing the descriptions of the disciplines I could copy paste as captions to you can search the disciplines and their abilities.
PROTECTION DOMAIN DISCIPLINES
Commander • hunker down (field increase damage; resist all)• courage (passive: increases lifesteal when a barrier placed on you.) 
Flow Controller • mass dispel (attack removes all barriers in an area)• cauterize (removes group bleeds, electrocution, burning and blackmantle) 
Force Mage • force wave (attackl push enemies away)• reactive barrier (passive: attacks randomly add barrier; attack power) 
Fortifier • sanctuary (field increase allies resitances) • overwhelming odds (passive: gain resistance when enemies near) 
Holy Avenger • battle chant (gain pulsing damage aura)• suns of worvan (barrier negates fire damage) 
Militant Mage • warp weapons (attack: decrease target’s attack power when they hit you)• sword ward (passive: gain slashing resistance when hit) 
Twister Of Fate • blade turning (barrier negates slashing damage)• fortification (group increase health max) 
Unstable Mage • wreckoning (attack: deals damage based on barrier amount)• arcane barrier (gain a barrier and elemental barrier resistance) 
Dispel • dispel (attack: cancel and punish barrier users) 
Finish Him • finish him (passive increase execute power damge) 
Glamour Weapon • glamour (increase attack power) 
Phantom Armor • phantom armor (passive: chance to gain armor class when hit) 
Rupture Barrier • rupture barrier (passive: increase damage vs barriers. gain resource) 
Rune Shield • rune shield (increase elemental resistances) 
Take Root • take root (passive: standing still buffs healing bonus) 
Weapon Finesse • weapon finesse (passsive: greatly reduces power resource costs)