Secret Sword Art skill level +2
Qigong -Yang skill level +5
Attack Speed +10%

Overdrive and Quintuple Strength let Queen of Pain possess you for 40 seconds. 
Dark Knights attack with a 1% chance of inviting Queen of Pain into their bodies for 40 seconds. 

Queen of Pain Possession Effects (Max Stacks: 1) 
-Attack/Movement Speeds +20% and Physical Attack +15% 
- Attacks create a 3% chance of casting Shrieking Queen of Pain.
(All these options are canceled when the item is unequipped.)

Secret Sword Art skill level +2 
Qigong -Yang skill level +5 
Attack Speed +10%

Overdrive and Quintuple Strength let Queen of Pain possess you for 40 seconds. 
Dark Knights attack with a 10% chance of inviting Queen of Pain into their bodies for 40 seconds. 

Queen of Pain Possession Effects (Max Stacks: 1) 
- Attack/Movement Speeds +20% and Physical Attack +15% 
- Attack/Movement Speeds +20% and Physical/Magical Defense +15% for Dark Knights 
- Attacks create a 3% chance of casting Shrieking Queen of Pain. 
(All these options are canceled when the item is unequipped.)

Overdrive skill level +2 
Quintuple Strength skill level +2
Shadowy Lightsabre Mastery skill level +2 

Attack damage +5% every empty quick skill slot 
Multiple damage bonuses do not stack. Only the bonus with the highest value applies. (Not applicable to Critical Damage)

Overdrive skill level +2 
Sentiment Du Fer skill level +2

Critical Damage +30% 
Multiple damage bonuses do not stack. Only the bonus with the highest value applies.

Overdrive skill level +2 
Sentiment Du Fer skill level +2 
Shadowy Katana Mastery skill level +2

Critical Damage +30% 
Multiple damage bonuses do not stack. Only the bonus with the highest value applies. 

(Dark Knight) 
3-piece Set Effect 
Dark Wave skill level +3 
5-piece Set Effect 
Wave skill level +3 

(Creator) 
3-piece Set Effect 
Flame Hurricane skill level +1 
5-piece Set Effect 
Wind Storm skill level +1 
Wind Press skill level +2

(Dark Knight) 
3-piece Set Effect 
Dark Wave Fall skill level +1 
5-piece Set Effect 
Charge Explosion skill level +1 

(Creator) 
3-piece Set Effect 
Ice Age skill level +1 
5-piece Set Effect 
Link skill level +1