General

Dragon Tail Set

Level 140, requires 170 LUK.
Assuming the set is reasonably obtainable (which it probably isn't lolol) why would you want something that requires so much of your secondary stat?
Well, according to Spadow and SP.net:

These are the bonuses you get for wearing a certain number of items in the set:

2 items:
WDEF +200
MDEF +300
ACC +200
Avoid +200

3 Items:
HP +15%
MP +15%

4 Items:
M. ATT +15

5 Items:
All Stat +15
All Skill +2

6 Items:
M. ATT +30
Boss Damage +30%

And these are the stats of the items themselves:

Hat:
Req Level: 140
Req INT: 420
Req LUK: 170
INT: +25
LUK: +25
HP: +300
MP: +300
WDEF: +150
MDEF: +200
Magic Attack: +1
Accuracy: +200
Avoid: +100
Equip tradeblock
Platinum Scissors of Karma
10 slots

Cape:
Req Level: 140
INT: +7
LUK: +7
WDEF: +100
MDEF: +200
Magic Attack: +1
Speed: +10
Jump: +5
Equip tradeblock
Platinum Scissors of Karma
7 slots

Glove:
Req Level: 140
Req INT: 420
Req LUK: 170
INT: +16
LUK: +16
HP: +350
WDEF: +30
MDEF: +70
Magic Attack: +5
Accuracy: +30
Equip tradeblock
Platinum Scissors of Karma
7 slots

Overall:
Req Level: 140
Req INT: 420
Req LUK: 170
INT: +30
LUK: +30
WDEF: +200
MDEF: +250
Magic Attack: +2
Accuracy: +50
Avoid: +50
Equip tradeblock
Platinum Scissors of Karma
12 slots

Shoes:
Req Level: 140
Req INT: 420
Req LUK: 170
INT: +15
LUK: +15
WDEF: +50
MDEF: +120
Magic Attack: +1
Avoid: +20
Speed: +10
Jump: +7
Equip tradeblock
Platinum Scissors of Karma
7 slots

Staff:
Req Level: 140
Req INT: 420
Req LUK: 170
INT: +35
LUK: +20
Magic Attack: +163
Weapon Attack: +101
Accuracy: +100
Equip tradeblock
Platinum Scissors of Karma
Slow(8)
8 slots

Wand:
Req Level: 140
Req INT: 420
Req LUK: 170
INT: +35
LUK: +20
Magic Attack: +161
Weapon Attack: +95
Accuracy: +100
Equip tradeblock
Platinum Scissors of Karma
Normal(6)
8 slots