Welcome to my little Guide.

This Guide will help you to unlock the hidden skills in Sword Art Online: Hollow Realization

If you have any quesions or want to correct me, fell free to write it down in the comment section.

This information was collected through the internet and fulfills the sole purpose to excess it easily via Steam.
Source and all credits to: SAO Hollow Realization DB[docs.google.com]

The information is based on the PS4 and Vita Version. Please inform me if you find any difference to the Steam-Version.

How to unlock:

1. Learn Star Saber or 1 Hand Sword Mastery from the 1 Hand Skill Tree.
   You can also learn both, but thats not necessary.
   You need to unlock one of the two skills to get connected to the Celestial Blade EX-Skill on the Skill-Board.
   
   
2. Hit 2000 enemys with a 1 Hand Sword Skill.
   It doesn't matter which skill you use how often. The total counts as long as the skills hits an enemy. Skills that miss don't count.
   Because this was often asked in the comments: At the info panel of your skills it will show you a number that calculates how often you used the skill and only 1 Hand Sword Skills that hit an enemy count to unlock Celestial Blades. It doesn't matter if you use a shield in the other hand or one shot enemys. You even can hit the enemy, walk away and leave him alive. The hit is what counts to unlock this EX-Skill.

Sub-Skills:

• Lightning Speed (Passive)
  Damage Multiplier Up +10%
  
  
• Scarlet Rampage
  Damage Multiplier +15% / 3 min.
  ATK Up +30% / 3 min.
  Defense Down -30% / 3 min.
  
  
• Final Revolution
  (Slashing)Hits:2 (AGI 80%) / Area of Effect (AoE)
  (Mob)Slow Lv5 -100% / 6 min.
  
  
• Dual Revelation
  (Slashing)Hits:6 (STR 90%) / Combo Attack
  (Mob)Attack Down -30% / 360 sec. Defense Down -30% / 360 sec."
  
  
• Perfect Style
  SP Recovered +300 CRT Up +30 / 120 sec.
  Attack Speed Up +10% / 120 sec.
  
  
• Crisis Crescendo
  Requirements: Requires 1000 swordskills with Celestial Blades set
  SSC Chain +16 / 90 sec.
  CRT DEF +100% / 90 sec.
  Damage Multiplier +50% / 90 sec.
  
  
• Voltage Assault
  (Slashing)Hits:10 (STR 50% DEX 80%) / Combo Attack
  (Mob) Damage Multiplier +10% / 3 min. Numb Lv1 +240 / 480 sec.
  
  
• Double Circular
  (Slashing)Hits:2 (AGI 60% DEX 40%) / Charge Attack
  SP Regen +240 / 60 sec.
  HP Regen +80% / 60 sec.
  
  
• Blazing Spin
  (Slashing)Hits:2 (DEX 80%) / Single Attack
  (Mob)Damage Multiplier +5% / 3 min. Slow Lv1 -100% / 20 sec.
  
  
• Nightmare Rain
  (Slashing)Hits:8 (STR 80% AGI 40%) / Heavy Attack / Super Armor
  
  
• Starburst Stream
  (Slashing)Hits:16 (AGI 30% DEX 50%) / Combo Attack
  ATK Up +5% / 5 min.
  DEF Up +5% / 5 min.
  
  
• The Eclipse
  Note: Ultimate Attack: Ends SSC / Grants additional +50% SSC damage bonus
  (Slashing)Hits:27 (AGI 100%) / Ultimate Attack
  Damage Multiplier +15% / 3 min.

How to unlock:

1. Block 3000 attacks with Protection Field.
   
   
2. Learn Tank EX.
   
   
3. Learn 1 Hand Sword Mastery OR Rapier Mastery.

Sub-Skills:

• Leadership (Passive)
  Aggro Gain Up +10%
  Aggro Loss Down -10%
  
  
• Protective Armor
  (Area)Ignore Damage (Duration) / 30 sec.
  
  
• Holy Square
  (Slashing)Hits:4 (STR 60% VIT 60% AGI 30% DEX 60%) / Combo Attack
  DEF Up +20% / 5 min.
  (Mob) Increase Aggro
  
  
• Shell of Hatred
  (Blunt)Hits:1
  (Mob)Increase Aggro Knockdown
  
  
• Protective Burst
  Max SP Down -1000 / 3 min.
  Counter +80 / 90 sec.
  
  
• Divine Cross
  (Slashing)Hits:2 (STR 60% VIT 30% AGI 30% DEX 60%) / Combo Attack
  Damage Multiplier +20% / 3 min.
  
  
• Battle Guardian
  DEF Based Attack Up +200% / 120 sec.
  SSC Chain +8 / 120 sec.
  
  
• Honor Guard
  Requirements: 1500 swordskills with Righteous Cross set
  (Slashing)Hits:3 (STR 60% VIT 30% AGI 30% DEX 60%) / Heavy Attack
  ATK Up +15% / 5 min.
  DEF Up +15% / 5 min.
  
  
• Battle Shout
  (Mob) Increase Aggro
  
  
• Divine Core
  Deflects an enemy attack.
  Heals nearby allies when successful.
  
  
• Aetheric Armageddon
  Note: Ultimate Attack: Ends SSC / Grants additional +50% SSC damage bonus
  (Slashing)Hits:10 (STR 60% VIT 30% AGI 30% DEX 60%) / Ultimate Attack / Super Armor
  Instant Damage Reflect 50%+50% / 60 sec.

How to unlock:

1. Learn Accelerate OR Veiled Rider
   
   
2. Defeat 2000 enemies.

Sub-Skills:

• Transformation (Passive)
  Max HP +15%
  
  
• Indomitable Spirit (Passive)
  Debuff Resistance +5
  
  
• Defense Prayer
  (Area)HP Recovered +25%
  (Area)HP Regen +80% / 60 sec.
  
  
• Benevolent Aura
  (Area)Physical Copy / 30 sec.
  
  
• Sprinter Stance
  (Area)Attack Speed Up +10%) / 120 sec.
  (Area)Cancel Duration Up +15% / 120 sec.
  
  
• Survivalist
  Max HP Up +20% / 3 min.
  HP Regen +50% / 60 sec.
  
  
• Active Perception
  Requirements: hitting enemies 20000 times
  (Area)HP Regen +80% / 120 sec.
  (Area)SP Regen +400 / 120 sec.
  
  
• Shiny Hollow
  Defense Down -50% / 3 min.
  Max SP Down -300 / 3 min.
  Physical Copy (12) / 30 sec.
  
  
• Limited Regeneration
  HP Regen +40% / 60 sec.
  
  
• Regenerative Force
  (Area)ATK Up (HP Regen) +40% / 60 sec.
  (Area)DEF Up (HP Regen) +40% / 60 sec.
  
  
• Frustration
  (Area)SP Based ATK Up +100% / 4 min.
  
  
• Flash Flood
  (Area)SSC Chain +3 / 3 min.
  
  
• Haggard Healing
  (Area)HP Regen +240% / 4 min.

How to unlock:

1. Learn Swift Steel OR Dagger Mastery.
   
   
2. Perform 3000 Critical Hits.

Sub-Skills:

• Scarecrow
  Decrease Aggro -505
  
  
• Thirst for Blood (Passive)
  ATK +30%
  Defense Down -30%
  
  
• Gilded Crescent
  (Slashing)Hits:1 (AGI 80% DEX 80%) / Single Attack
  Backstab CRT Up +30 / 30 sec.
  
  
• Lover's Sacrifice
  HP Leak -360% / 3 min.
  ATK Up +50% / 120 sec.
  
  
• Stalwart Shangri-La
  Recast Time +50% / 3 min.
  CRT Up +30 / 120 sec.
  
  
• Lurking Phantom
  (Slashing)Hits:13 (AGI 80% DEX 80%) / Heavy Attack
  (Mob)At Risk / 60 sec.
  (Mob)Damage Multiplier +80% / 240 sec.
  
  
• Piercing Legacy
  Backstab CRT Up +20 / 180 sec.
  ATK Up +30% / 180 sec.
  Defense Down -50% / 180 sec.
  
  
• Bloody Beak
  Requirements: 2000 critical hits from behind
  HP Absorb +5% / 90 sec.
  SSC Chain +4 / 180 sec.
  
  
• Counter
  Counter +30% / 3 min.
  
  
• Mad Knight
  Damage Instant Reflect +300% / 180 sec.
  
  
• Nightfall
  Note: Ultimate Attack: Ends SSC / Grants additional +50% SSC damage bonus
  (Slashing)Hits:12 (AGI 80% DEX 80%) / Ultimate Attack
  ATK Up (Risk) +240% / 240 sec.

How to unlock:

1. Learn Banishment OR 1H Club Mastery/b]
   
   
2. Recover 100,000 HP.

Sub-Skills:

• Efficient Movement (Passive)
  SP Regen +1 / 1 Sec.
  
  
• Healing Lure
  (Area))HP Regen +80% / 120 sec.
  (Area)ATK Up +30% / 120 sec.
  
  
• Purifying Flame
  (Area) Debuff Cured 100%
  
  
• Fairy Whisper
  Requirements: Heal HP 60000 times when below 50% HP
  (Area)HP Recovered +60%
  
  
• Brilliant Spirit
  HP Recovery Up +3% / 3 min.
  
  
• Combined Strength
  (Area)HP Regen 80% / 120 sec.
  (Area)DEF Up +30% / 120 sec.
  
  
• Uplifting Energy (Passive)
  Recast Time -10%
  
  
• Growth
  (Area)Max HP Up +20% / 3 min.
  
  
• Heroic Impulse
  Max HP Down -50% / 60 sec.
  (Area)HP Recovered +50%
  
  
• Flawless Energy
  (Area)Full Heal +100%

How to unlock:

1. Learn Combo Freak OR Katana Mastery.
   
   
2. Perform 3200 SSC.

Sub-Skills:

• Crescent Moon Stance
  Note: Canceled if hit
  Swordskill Damage +50%
  Defense Down -50%
  
  
• One with the Sword (Passive)
  Max SP +150
  
  
• Renge
  (Slashing)Hits:1 (STR 80% DEX 80%) / Area of Effect (AoE)
  (Mob)Bleed Lv5 -120 / 50 sec.
  
  
• Valiant Stance
  Requirements: 2100 3-hit SSC
  Note: Canceled if hit
  Swordskill Damage +120%
  Defense Down -100%
  
  
• Energy Siphon
  Just Step SP Recovery +50 / 3 min.
  
  
• Shinsou
  (Slashing)Hits:10 (AGI 100% DEX 80%) / Area of Effect (AoE) / Super Armor
  (Mob)Defense Down -80% / 480 sec.
  
  
• Crisis Stance
  Requirements: 2400 5-hit SSC
  Note: Canceled if hit
  Swordskill Damage +300%
  Defense Down -200%
  
  
• Hifubiki
  (Slashing)Hits:39 (VIT 100% AGI 100%) / Charge Attack
  ATK Up +20% / 5 min.
  Movement Speed Up +20% / 3 min.
  
  
• Clear Mind
  Defense Down -50% / 3 min.
  SP Regen +900 / 3 min.
  
  
• Defense Disabler
  Ignore Defense / 60 sec.
  
  
• Blood Price
  HP Leak -540% / 3 min.
  Defense Down -75% / 3 min.
  Max SP Up +300 / 3 min.

How to unlock:

1. Learn Brave Soul OR 2H Sword Mastery.
   
   
2. Perform 44 resurrections.

Sub-Skills:

• Wounding Strike
  Slashing / Thrusting / Blunt Resistance Up +20 / 30 sec.
  
  
• Tranquil Guard (Passive)
  Note: 10% Damage Reduction
  Damage Resistance +10
  
  
• Healing Caress
  Requirements: Reach 3.0 Damage Multiplier 300 times
  HP Recovered +50%
  Increase Aggro
  
  
• Aerial Shield
  (Area)Ignore Breath / 1 sec.
  
  
• Iron Will (Passive)
  DEF Up +25%
  
  
• Shining Echo
  (Area)ATK Up +15% / 60 sec.
  (Mob)HP Regen +50% / 60 sec.
  Aggro Gain Up +50% / 60 sec.
  Increase Aggro
  
  
• Trance State
  (Area)HP Recovered +50%
  (Area)Physical Barrier +1000 / 10 sec.
  
  
• Elemental Desire
  Battle Skill Range Up +100% / 120 sec.
  
  
• Phantom Defender
  Physical Copy / 30 sec.
  
  
• Knightly Divinity
  (Area)Slashing / Thrusting / Blunt Resistance Up +20 / 60 sec.
  Max SP Down -1000 / 90 sec.
  
• Battle Healing
  HP Regen +80% / 60 sec.

How to unlock:

1. Learn 2H Sword Mastery OR Lightning Stance.
   
   
2. Deal a total of 10,000,000 damage.

Sub-Skills:

• Maddening Blow
  HP Leak -360% / 3 min.
  ATK Up +15% / 120 sec.
  
  
• Fighting Spirit (Passive)
  HP Based ATK Up +50%
  
  
• Vicious Strike
  (Slashing)Hits:2 (VIT 100% DEX 100%) / Single Attack
  (Mob)Attack Down -30% / 120 sec.
  (Mob)Defense Down -30% / 120 sec.
  
  
• Bloody Servant
  HP Leak -360% / 3 min.
  HP Based ATK Up +200% / 3 min.
  
  
• Blades of Dread
  (Slashing)Hits:5 (VIT 100% DEX 100%) / Heavy Attack
  HP Based ATK Up +500% / 150 sec.
  
  
• Strength
  STR Up +30% / 30 sec.
  ATK Up +15% / 30 sec.
  
  
• Last Resort
  SP Leak -540 / 3 min.
  Ignore Defense / 60 sec.
  
  
• Burst Error
  HP Leak -360% / 3 min.
  SP Regen +900 / 3 min.
  SSC Chain +4 / 60 sec.
  
  
• Black Death
  Requirements: Deal a total of 15,000,000 damage
  (Slashing)Hits:2 (VIT 100% DEX 100%) / Area of Effect (AoE)
  HP Absorb +666 / 60 sec.
  
  
• Crimson Weapon
  Max HP Down -50% / 180 sec.
  ATK Up +50% / 180 sec.
  
  
• Depths of the Abyss
  Note: Ultimate Attack: Ends SSC / Grants additional +50% SSC damage bonus
  (Slashing)Hits:6 (VIT 100% DEX 100%) / Ultimate Attack
  ATK Up +50% / 5 min.
  Bleed Lv5 -120 / 50 sec.

How to unlock:

1. Learn 2H Spear Mastery OR Killing Blow.
   
   
2. Inflict Debuffs 250 times.

Sub-Skills:

• Offensive Defense (Passive)
  Counter +3%
  
  
• Rhythmic Footwork (Passive)
  SP Cost Down -3%
  SP Regen +1 / 1 sec.
  
  
• Deep Thorn
  (Mob) Bind -100% / 60 sec.
  
  
• Straight Strike
  (Thrusting)Hits:1 (STR 20% VIT 60% AGI 20% DEX 60%) / Charge Attack
  (Mob)Bind -100% / 45 sec.
  
  
• Impediment
  Step SP Cost Down -50% / 120 sec.
  SSC Chain +8 / 120 sec.
  
  
• Impassion
  (Mob)Bind -100% / 30 sec.
  SS Cost 0 SP -100% / 30 sec.
  
  
• Tanglevine
  Requirements: Inflict Debuffs 400 times
  (Mob)Bind -100% / 60 sec.
  
  
• Nimble Feet (Passive)
  Attack Speed Up +5%
  Recast Time -5%
  
  
• Parallel Restraints
  (Thrusting)Hits:4 (STR 60% VIT 60% AGI 20% DEX 20%) / Area of Effect (AoE)
  (Mob)Bind -400% / 180 sec.
  
  
• Chimera Divison
  (Thrusting)Hits:4 (STR 80% VIT 80% AGI 80% DEX 80%) / Heavy Attack
  ATK Up Bind +100% / 120 sec.
  
  
• Endless Melody
  Note: Ultimate Attack: Ends SSC / Grants additional +50% SSC damage bonus
  (Thrusting)Hits:3 (STR 80% VIT 80% AGI 80% DEX 80%) / Ultimate Attack
  (Mob)STR/VIT Down Lv3 -50% / 2 min.
  (Mob)DEX/AGI Down Lv3 -50% / 2 min.

Have fun while unlocking all this EX Skills or just your favorite one.

I hope you enjoyed this humble guide and that it will help you.

Sincerely
Your Gevatter Tod