From MU Online Guides and Tutorials
Combination Parts and Options 
Summary Unlocked Options

Agnis (Mask, Armor, Ring of Poison)
Increase defensive skill when using shield weapons 20%
Double Damage Rate 25%
Increases Defensive Skill +125
Increases Skill Attacking Rate +125
Increases Critical Damage Rate 40%
Increases Excellent Damage Rate 40%
Decreases opponent's defense rating +15%
Browii (Pants, Gloves, Boots, Pendant of Ice)
Double Damage Rate 25%
Increases Critical Damage Rate 25%
Increases Excellent Damage Rate 35%
Decreases opponent's defense rating +25%
Increases Damage +125
Increases Maximum Stamina +125

Increase defensive skill when using shield weapons 20%
Double Damage Rate 50%
Increases Defensive Skill +125
Increases Skill Attacking Rate +125
Increases Critical Damage Rate 65%
Increases Excellent Damage Rate 75%
Decreases opponent's defense rating +40%
Increases Damage +125
Increases Maximum Stamina +125

Note:
 You can check each item/set's articles for more detailed information.
Agnis+Browii+Tartarus combination
Combination Parts and Options 
Summary Unlocked Options

Agnis (Mask, Armor, Ring of Poison)
Increase defensive skill when using shield weapons 20%
Double Damage Rate 25%
Increases Defensive Skill +125
Increases Skill Attacking Rate +125
Increases Critical Damage Rate 40%
Increases Excellent Damage Rate 40%
Decreases opponent's defense rating +15%
Browii (Pants, Gloves, Boots, Pendant of Ice)
Double Damage Rate 25%
Increases Critical Damage Rate 25%
Increases Excellent Damage Rate 35%
Decreases opponent's defense rating +25%
Increases Damage +125
Increases Maximum Stamina +125
Tartarus (Tartarus Mace of Emperor+Ring of Magic)
Increases Skill Attacking Rate +125
Double Damage Rate 15%
Decreases opponent's defense rating +10%

Increase defensive skill when using shield weapons 20%
Double Damage Rate 65%
Increases Defensive Skill +125
Increases Skill Attacking Rate +250
Increases Critical Damage Rate 65%
Increases Excellent Damage Rate 75%
Decreases opponent's defense rating +50%
Increases Damage +125
Increases Maximum Stamina +125

Note:
 In game the ancient options of the set show differently in the options menu, but they work perfectly.
 You can check each item/set's articles for more detailed information.
Agnid+Browii+Sacred combination
Combination Parts and Options 
Summary Unlocked Options

Agnis (Mask, Armor, Ring of Poison)
Increase defensive skill when using shield weapons 20%
Double Damage Rate 25%
Increases Defensive Skill +125
Increases Skill Attacking Rate +125
Increases Critical Damage Rate 40%
Increases Excellent Damage Rate 40%
Decreases opponent's defense rating +15%
Browii (Pants, Gloves, Boots, Pendant of Ice)
Double Damage Rate 25%
Increases Critical Damage Rate 25%
Increases Excellent Damage Rate 35%
Decreases opponent's defense rating +25%
Increases Damage +125
Increases Maximum Stamina +125
Sacred Mace of the King (Mace+Ring of Wind)
Increases Skill Attacking Rate +125
Double Damage Rate 10%

Increase defensive skill when using shield weapons 20%
Double Damage Rate 60%
Increases Defensive Skill +125
Increases Skill Attacking Rate +250
Increases Critical Damage Rate 65%
Increases Excellent Damage Rate 75%
Decreases opponent's defense rating +40%
Increases Damage +125
Increases Maximum Stamina +125

Note:
 In game the ancient options of the set show differently in the options menu, but they work perfectly.
 You can check each item/set's articles for more detailed information.
See also
Agnis Adamantine Set
Browii Adamantine Set
Tartarus Mace of the Emperor Set
Sacred Mace of the King Set