The Ritualist
is best for endgame and specially if problem with -fire res. Also for damage only and farming 
The Ritualist
Gambeson (Sacred)
Defense: (5583 - 6345) to (5951 - 6762)
(Sorceress Only)
Required Level: 100
Required Dexterity: 486
Item Level: 105
+(3 to 5) to Sorceress Skill Levels
+50 Spell Focus
Firedance Cooldown Reduced by 6 seconds
+20% to Fire Spell Damage
-20% to Enemy Fire Resistance
+(120 to 150)% Enhanced Defense
+3000 Defense vs. Missile
Fire Absorb 5%
+(30 to 50) Life after each Kill
Socketed (6)
Gambeson (Sacred)
Defense: (5583 - 6345) to (5951 - 6762)
(Sorceress Only)
Required Level: 100
Required Dexterity: 486
Item Level: 105
+(3 to 5) to Sorceress Skill Levels
+50 Spell Focus
Firedance Cooldown Reduced by 6 seconds
+20% to Fire Spell Damage
-20% to Enemy Fire Resistance
+(120 to 150)% Enhanced Defense
+3000 Defense vs. Missile
Fire Absorb 5%
+(30 to 50) Life after each Kill
Socketed (6)
Radiance

Radiance
Tiara (Sacred)
Defense: 725 to 820
Required Level: 100
Required Dexterity: 392
Item Level: 120
+2 Spell Focus per 1 Light Radius
+3% Fire Spell Damage per 1 Light Radius
-1% Cold Spell Damage per 1 Light Radius
+(2 to 3) to All Skills
-(15 to 20)% to Enemy Fire Resistance
Physical Resist 10%
Cannot Be Frozen
-5% to All Vendor Prices
Socketed (4)
Tiara (Sacred)
Defense: 725 to 820
Required Level: 100
Required Dexterity: 392
Item Level: 120
+2 Spell Focus per 1 Light Radius
+3% Fire Spell Damage per 1 Light Radius
-1% Cold Spell Damage per 1 Light Radius
+(2 to 3) to All Skills
-(15 to 20)% to Enemy Fire Resistance
Physical Resist 10%
Cannot Be Frozen
-5% to All Vendor Prices
Socketed (4)
Iblis (Xis)
Lunar Eclipse

Lunar Eclipse
Light Belt (Sacred)
Defense: (2091 - 2422) to (2171 - 2514)
Required Level: 100
Required Strength: 550
Item Level: 120
+2 to All Skills
+(51 to 60) Spell Focus
25% Cast Speed
30% Hit Recovery
+(10 to 15)% to Spell Damage
+(90 to 120)% Enhanced Defense
+(40 to 50) to Energy
+100 to Life
Elemental Resists +15%
+5 to Light Radius
Socketed (2)
Light Belt (Sacred)
Defense: (2091 - 2422) to (2171 - 2514)
Required Level: 100
Required Strength: 550
Item Level: 120
+2 to All Skills
+(51 to 60) Spell Focus
25% Cast Speed
30% Hit Recovery
+(10 to 15)% to Spell Damage
+(90 to 120)% Enhanced Defense
+(40 to 50) to Energy
+100 to Life
Elemental Resists +15%
+5 to Light Radius
Socketed (2)
Victory (Xis)
combo.And for flamestrike only build a crafted war staff with +10 skill 50 fire spell 100+ spell focus and -fire res orZodiac
Sauron
. This build with only The Warmage
and tu items can do up to lv 130 ubersThe Warmage
(Sorceress Fire Set)
Warmage's Breath
Warmage's Fireblade
Warmage's Flameshroud
Warmage's Wake
Set Bonus with 2 or more set items:
+24 to Fire Cascade
+50 to Strength
Set Bonus with 3 or more set items:
+16 to Banish
Elemental Resists +75%
Set Bonus with complete set:
2% Chance to cast level 40 Lifeblood when Struck
+5 to Sorceress Skill Levels
10% Movement Speed
+25% to Spell Damage
+30 to Jinn
100% to Energy
5% Chance to Avoid Damage
(Sorceress Fire Set)
Warmage's Breath
Warmage's Fireblade
Warmage's Flameshroud
Warmage's Wake
Set Bonus with 2 or more set items:
+24 to Fire Cascade
+50 to Strength
Set Bonus with 3 or more set items:
+16 to Banish
Elemental Resists +75%
Set Bonus with complete set:
2% Chance to cast level 40 Lifeblood when Struck
+5 to Sorceress Skill Levels
10% Movement Speed
+25% to Spell Damage
+30 to Jinn
100% to Energy
5% Chance to Avoid Damage