the sorc can get Spiral Dance from rare/magic/crafted sorc sword/sorc armor /
Astarte
/
Wedding Dress of the Zann
Wedding Dress of the Zann
Ceremonial Armor (4)
Defense: (352 - 409) to (706 - 821)
(Sorceress Only)
Required Level: 12
Required Dexterity: 97
Item Level: 29
15% Attack Speed
+(2 to 3) to Spiral Dance
4% Deadly Strike
+(35 to 57)% Enhanced Defense
+(16 to 25) to Strength
+(16 to 25) to Dexterity
Socketed (2)
Defense: (1131 - 1268) to (2161 - 2423)
(Sorceress Only)
Required Level: 31
Required Dexterity: 143
Item Level: 40
30% Attack Speed
+(4 to 5) to Spiral Dance
6% Deadly Strike
+(81 to 103)% Enhanced Defense
+(36 to 45) to Strength
+(36 to 45) to Dexterity
Socketed (4)
Defense: (2818 - 3105) to (5286 - 5824)
(Sorceress Only)
Required Level: 48
Required Dexterity: 300
Item Level: 67
45% Attack Speed
+(6 to 7) to Spiral Dance
8% Deadly Strike
+(126 to 149)% Enhanced Defense
+(56 to 65) to Strength
+(56 to 65) to Dexterity
Socketed (5)
Defense: (4203 - 4574) to (7888 - 8585)
(Sorceress Only)
Required Level: 55
Required Dexterity: 622
Item Level: 85
60% Attack Speed
+(7 to 8) to Spiral Dance
10% Deadly Strike
+(149 to 171)% Enhanced Defense
+(66 to 75) to Strength
+(66 to 75) to Dexterity
Socketed (6)
/ with 4 set items on from the Mysteries set .
the COTW makes no sense having while being a Sorc , as you can access that oskill from many other options starting since early game .
Spiral Dance has some delay before the hit is applied (it first swirls in the air a bit), thing that won't be very pleasant for an assassin ,that is usualy squishy and needs to deliver quick damage then gtfo . the weapon damage modiffier is also not worth the trouble + it converts a big chunk of the physical damage to magic damage , so you won't leech too much with it either .
my 2 cents