Dear Crows, let me give you a quick overview on the JUSTICE 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.
JUSTICE DOMAIN DISCIPLINES
Defender • hunker down (field increase damage; resist all)• dig in (passive: crit defense on low health) 
Friar • chain heal (target heal multiple allies)• fortuitous blessings (passive: periodically gain random buff) 
Kanes Apostle • fortification (group increase health max)• cracked armor (buff: increases group crushing penetration) 
Militant Mage • warp weapons (attack: decrease target’s attack power when they hit you)• sword ward (passive: gain slashing resistance when hit) 
Rune Caster • sanctuary (field increase allies resistances)• reactive barrier (passive: attacks randomly add barrier; attack power) 
Scrapper • in the fray (buff: increases yout attack power lifesteal)• death throws (passive: area knockdown on retaliation) 
Shock Trooper • banner of storms (group electricity, ice resistance and damage bonus) 
Standard Bearer • rallying banner (group attack power; rescue healing; slow cleanse)• resolution (passive: gain damage when enemies near) 
Transcendent Warrior • guiding light aura (toggle: increase group damage bonus: fire and holy)• divine aura (toggle: group increase to support power and personal healing modifier) 
Bearers Insignia • bearers insignia (passive: increase out of combat regeneration; gain resources when healing) 
Blood Rose • blood rose (passive: healed targets gain thornshield buff) 
Careless Whisper • careless whisper (passive: basic attacks buff crit stats) 
Crazy Pills • crazy pills (passive: increase damage on low resource) 
Payback • payback (passive: gain crit following retaliation) 
Reactionary • deadly retaliation (retaliate with high crit chance) 
Rune Shield • rune shield (increase elemental resistances)