Dear fellow Crows,
let me give you a quick overview on all the Major Disciplines that Crowfall has to offer. If you want to check out what each Specialization Class brings to the table check out my Races and Classes Guide.
In case you are interested in specific Disciplines check out the Crowfall Domain Overviews for Major and Minor Disciplines.
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.
Adjudicator • adjudicate (attack: inflict holy damage)• rupture barrier (passive: increase damage vs barriers; gain resource) 
Abominable Snowman • aura of terror (lingering enemies suffer frostbite; suppression)• terrifying features (passive: attackers periodically stunned) 
Agent Provocateur • caltrops (stealth: target area snare: pierce debuff)• lay low (stealth: heal over time) 
Arcane Archer • arcane arrow (attack: applies armor break to enemies in its path)• arcane barrier (gain a barrier, and elemental barrier resistance) 
Arkons Disciple • arkon’s fury (attack: applies major burning to target)• fiery brand (passive: chance to elemental break when dealing fire damage) 
Avatar Of Storms • storm avatar (?) • call lightning (attack: stuns target) 
Banshee • haunt (attack: reflect enemy damage; healing)• angel of death (passive: increase enemy damage at low health) 
Black Mask • study target (passive: damage bonus increased during stealth) 
Blade Dancer • slashing grace (buff: increase group slashing penetration)• blood price (passive: spawn healing orbs; attack power) 
Blade Master • blood strike (attack: bleed multiple enemies)• blood price (passive: spawn healing orbs; attack power) 
Blitzer • banner of storms (group electricity. ice resistance and damage bonus)• haunt (attack: reflect enemy damage; healing) 
Blood Feeder • bite (attack: applies bleed)• tasty (passive: grants lifesteal when attacking bleeding targets) 
Bloodletter • purgative (cleanse damage over time with healing)• exanguinate (passive: increases duration and damage of bleeds) 
Bringer Of Life • fountain of life (ground target area: healing)• purify (removes group blackmantle, frostbite, pulsing damage aura and disease) 
Butcher • tenderize (attack: adds a debuff to an enemy that makes them take more bleeding damage for 15 seconds)• angel of death (passive: increase enemy damage at low health) 
Cloisterer • benediction (group increase bleed resistance)• spite (passive: regenerate when stunned; knocked down) 
Commander • hunker down (field increase damage; resist all)• courage (passive: increases lifesteal when a barrier placed on you.) 
Convictor • prosecute (attack: damage scales with sin)• mortal sin (passive: target debuff anti-critical strike) 
Corrupted Soul • shrivel (attack: blackmantle; disease; expose punish)• soul steal (attack: deals damage to enemies in a field, returning health) 
Dazzler • dazzling blade (attack: reduce enemy crit hit chance)• resolution (passive: gain damage when enemies near) 
Dead Eye • multi-shot (attack: cone damage five enemies)• careless whisper (passive: basic attacks buff crit stats) 
Deadly Infector • diffusion (attack: damage scales with active poisons)• envenom (attack: hits all enemies. applies all poison buffs to you) 
Defender • hunker down (field increase damage; resist all)• dig in (passive: crit defense on low health) 
Demolisher • cracked armor (buff: increases group crushing penetration)• shield breaker (attack: cancel and punish block and parry) 
Destroyer • aegis of salvation (attack: adds barrier and heal)• insanity (gains health based on rage) 
Dirty Fighter • festering wound (attack: reduce healing; expose on healing)• crazy pills (passive: increase damage on low resource) 
Dryad • blast of leaves (heal: channeled cone aoe)• nature’s avatar (buff: increase a target ally’s damage bonus and critical strike by a large amount) 
Elementalist • neutralize elements (remove group burning, frostbite, electrocution and poison)• sentinel (increase critical chance when standing still) 
Entertainer • bolstering ballad (passive: increase group max health when singing)• reprise (passive: increase song radius) 
Escape Artist • purgative (cleanse damage over time with healing)• escapology (passive: gain increased resolve from control effects) 
Exorcist • soul steal (attack: deals damage to enemies in a field, returning health)• blessed symbol (passive: increase critical healing chance and amount at low health) 
Faerie Trapper • concussive trap (trap: stuns targets)• faerie trap (passive: traps now reduce mitigation and block stealth) 
Fencer • cut and thrust (attack: stun vs block or parry)• critical dodge (passive: critical strikes restore dodge) 
Field Surgeon • rescue (target ally avoids death)• fly you fools (passive: on death, heal and buff movement speed of your group) 
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) 
Forest Creature • pixie dust (ground target area increase incoming heals)• slow stake (field: snares enemies) 
Fortifier • sanctuary (field increase allies resitances) • overwhelming odds (passive: gain resistance when enemies near) 
Freedom Fighter • free action (group crowd control immunity; cleanse)• purify (removes group blackmantle, frostbite, pulsing damge aura and disease) 
Friar • chain heal (target heal multiple allies)• fortuitous blessings (passive: periodically gain random buff) 
Frostbiter • decay (attack:frostbite; expose punish)• rotting frost (passive: applies blackmantle when you apply frostbite) 
Frozen Dancer • frigid ground (attack: apply frostbite in a line)• harsh elements (passive: reduce enemy ice resistance on applying frostbite) 
Gapfinder between the seams (buff: increase group piercing penetration)pin cushion (barrier negates piercing damage) 
Grim Reaper • shrivel (attack: blackmantle; disease; expose punish)• ghost army (attack: damage multiple enemies; healing) 
Heavy Hitter • reverberating blow (attack: target enemey pulses damaging aura)• overwhelming odds (passive: gain resistance when enemies near) 
Hellraiser • pin cushion (baarrier negates piercing damage)• needlin’ haystack (reflect piercing damage; attackers bleed) 
Holy Avenger • battle chant (gain pulsing damage aura)• suns of worvan (barrier negates fire damage) 
Holy Warrior • restoration strike (attack: combo restores resouce)• guiding light aura (toggle: increase group damage bonus fire and holy) 
Hydrologist • water spirits (attack: heals allies; reduce enemy fire damge)• cauterize (removes group bleeds, electrocution, burning and blackmantle) 
Ice Armorer • ice armory (buff: group armor increased)• ice devourer (passive: heals, increases healing modifer on ice damage taken) 
Intimidator • frighten (attack: reduce enemy damage)• relentless (passive: restore rage in combat) 
Kanes Apostle • fortification (group increase health max)• cracked armor (buff: increases group crushing penetration) 
Kinetic Bloomer • kinetic boost (gain damage bonus; reduce ability cost)• root stake (field: roots enemies) 
Knife Grinder • long live the fighter (passive: adds the bleeding debuff to an enemy on every third basic attack)• shrapnel (passive: chance to spread bleeds on attack) 
Lazarus Disciple • grabthar’s hammer (attack: combo stuns an enemy)• suns of worvan (barrier negates fire damage) 
Leecher • leeching seed (attack: slows target. heal self for damage dealt)• bearer’s insignia (passive increase out of combat regeneration; gain resources when healing) 
Lightfoot • forest step (attack: blink to a targe and strike)• escapolgy (passive: gain increased resolve from control effects) 
Lord of the Forest • wee one (attack: ground target area reduce enemy damge)• protection stake (field: reduce your damage taken) 
Master Of Axes • furious slash (attack: combo reduces cooldowns)• demolish armor (attack: inflict armor break) 
Master Of Daggers • cripple (attack: combo reduces enemy attack power)• shadows linger (passive: increase criticial damage amount after losing stealth) 
Master Of Darkness • stink bomb (stealth: target area stun; moderate corruption)• preparation (passive: generate pips while stealthed) 
Master Of Focus • chaos orb (attack: slow pulsing damage projectile)• mana shield (mana reinforced barrier) 
Master Of Maces • skullcracker (attack: stun enemies)• will of the stoneborn (increase crushing resistance; weapon efficiency) 
Master Of Swords • critical hack (attack: increase critical strike)• iron skin (increase slashing resistance; reduce weapon resource cost) 
Militant Mage • warp weapons (attack: decrease target’s attack power when they hit you)• sword ward (passive: gain slashing resistance when hit) 
Minstrel • verses of victory (song: increase group attack, support power)• hymn of restoration (song: increase group health regen)• song twisting (passive: twisting songs increases song potency) 
Molten Mage • magma ball (attack: applies burning to target)• conduction (passive: increase attack power after taking fire damage) 
Mudman • muck spatter (crushing attacks trigger area blindness; corruption)• jelly skin (barrier negates crushing damage) 
Naiad • fountain of life (ground targer area: healing)• cleanse (removes group bleeds, diseases, poisions and aurea emitters) 
Natures Guardian • will o’ wisp (launch a healing orb that heals allies in an area)• slow stake (field: snares enemies) 
Night Terror • terrifying features (passive: attackers periodically stunned) 
Nightstalker • vampire sight (passive: increases perception, far-sight and stealth at night)• feeding time (passive: attacks have a chance to grant lifesteal and increase attack power) 
Pack Leader • form life (heal: place healing orbs)• pack avatar (increase damage bonus and critical strike for your group) 
Paragon • rehabilitation (target ally heal over time scaling with stamina)• vengeful aura (aura: increase the attack power of your group) 
Pixie • soothing winds (target heal allies over time)• pix fix (passive: increase chain heal jumps; falloff reduction) 
Petrifier • petrification illusion (increase basic attack damage and adds slow to 3rd basic attack)• nothing to lose (increase crit hit chance amount) 
Plague Lord • festering wounds (attack: reduce healing; expose on healing)• contagion (attack: spreads poisons to nearby enemies) 
Poison Sapper • spirit dart (attack: activates crippling poisons. return to stealth if undamaged)• poison paradise (buff: increases lifesteal when a poison toxin is equipped) 
Poison Trapper • concussive trap (trap: stuns targets)• toxic trap (passive: adds blackmantle to your traps) 
Reality Tripper • alter reality (attack: absorb enemy healing)• last restort (passive: gain crit chance on low health) 
Poisoner • poisoned blade (attack: adds the poison buff to yout attacks)• poisoned weapons (passive: basic attacks now deal poison damage) 
Reality Warper • spiritual decay (decrease healing bonus of enemies around you)• • shrivel (attack: blackmantle; disease; expose punish) 
Reaver • invincible warrior (ultimate: damage preventation and heal over time, removes cc)• gash (attack: applies severe bleed) 
Redeemer • redemption (attack: shoot multiple fireballs)• concentration (passive: restore mana, zealotry when immobile) 
Runescarred Gladiator • reprisal (reduce damage; deal damage in an area based on damage taken)• nothing to lose (increase cit hit chnace amount) 
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) 
Sharpshooter • binding arrows (attack: ground target area root)• all clear (passive: increase damage when apart from enemies) 
Shield Fighter • mighty shield slam (charged attack: push back enemies)• brutal slam (attack: reduce enemy physical mitigation) 
Shock Trooper • banner of storms (group electricity, ice resistance and damage bonus) 
Shieldmaster • mighty shield slam (charged attack: push back enemies)• shieldmanship (passive: shield bash damage increased. shield attacks enable shield bash) 
Speed Demon • closing speed (passive: movement speed increase when hit with ranged attacks)• marked for death (mark a target to take increased damage from group members) 
Spirit Speaker • gaea’s wail (attack: unleashes a spirit bear towards your enemies, chaining to additional enemies)• ghost army (attack: damage multiple enemies; healing) 
Stalker • hamstring (passive: slow enemies that are currently bleeding)• angel of death (passive: increase enemy damage at low health) 
Stalwart • get behind me (buff: while blocking grant damage reduction to group)• molon labe (passive: blocks reflect elemental damage) 
Standard Bearer • rallying banner (group attack power; rescue healing; slow cleanse)• resolution (passive: gain damage when enemies near) 
Sun Worshiper • soothing winds (target heal allies over time)• cleanse (removes group bleeds, diseases, poisons and aura emitters) 
Thorny Warrior • dagger spin (attack: damages enemies in an area)• root stake (field: roots enemies) 
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) 
Troubadour • requiem (song: increase enemy damage taken)• consonant chains (song: damage: snare enemies)• song twisting (passive: twisting songs increases song potency) 
Tundra Mage • brittle armor (attack: reduces physical mitigations)• freezing storm (attack: slows, then stuns an area) 
Tubthumper • spite (passive: regenerate when sutnned; knocked down)• escapology (passive: gain increased resolve from control effects) 
Tunnel King • go for broke (attack: leap from your burrow to deliver a barrage of bullets, then re-enter your burrow if you take no damage during the attack)• snipe (attack: exit stealth to shoot a target and generate two pips) 
Twister Of Fate • blade turning (barrier negates slashing damage)• fortification (group increase health max) 
Unholy Beast • undead fortitude (passive: immune to blackmantle and bleed)• everblooming (passive: immune to slow effects) 
Unstable Mage • wreckoning (attack: deals damage based on barrier amount)• arcane barrier (gain a barrier and elemental barrier resistance) 
Windlord • pursuit (self buff: increases movement speed for a short duration)• first wind (passive: regenerate when low health) 
Waylayer • cheap shot (attack: stuns enemy ignoring resolve)• study target (passive: damage bonus increased during stealth) 
Shadowmaster • ambush (attack)• shadows linger (passive: increase critical damage amount after losing stealth)