Build:Ranged Only Hex Mage

Cooldown Calculation

 * 40% Cooldown Reduction (Maximum Alert & Daredevil Breakthrough)
 * 10% Cooldown Reduction (Energized from Purpkin Pie)
 * Not including certain Skill Rewards (If you know them, you can add the damage calculation)

Cooldown Reduction total = 50%

New Torment cooldown = 5s

Mana Cost reduction
45% Natural, 80% With Gaberry Wine + Mage Tent

Damage Bonuses

 * Ethereal: 60% (30 Boon, 30 Lockwell's Revelation)
 * Decay: 100% (30 Boon, 15 Corrupted, 25 Rust Lich Set, 30 Lockwell's Revelation)
 * Light: 100% (30 Boon, 25 Rust Lich Set, 5 Flux, 10 Light Mender's Backpack, 30 Lockwell's Revelation)
 * Frost: 115% (30 Boon, 25 Rust Lich Set, 15 Thermal Claymore, 15 Corrupted, 30 Lockwell's Revelation)
 * Fire: 100% (30 Boon, 25 Rust Lich Set, 15 Thermal Claymore, 30 Lockwell's Revelation)

Damage-over-Time Effects
Poisoned: 1.5 * 200% * 90 seconds = 270 damage

Burning: 3 * 200% * 40 seconds = 240 damage

Damage Total - Torment
Torment total damage: = 20 20  20  20  20  = (20 * 1.6) + (20 * 2) + (20 * 2) + (20 * 2.15) + (20 * 2) = 32 + 40 + 40 + 43 + 40 = 195 total damage

Assuming the enemy has 0 all resistances (eg. Pearlbird): * 1.25 (Hexes) = 243.75 total damage

Assuming it takes about 1 second to cast Torment (roughly): = 60 / 6 = 10 casts per minute = 32.5 DPS = (40.625 DPS if counting Hexes against 0 Resist enemy)

Damage Total - Rupture
Rupture total damage: = 50 50  50  50  50  = (50 * 1.6) + (50 * 2) + (50 * 2) + (50 * 2.15) + (50 * 2) = 80 + 100 + 100 + 107.5 + 100  = 487.5 total damage

Assuming the enemy has 0 all resistances (eg. Pearlbird): * 1.25 (Hexes) = 609.375 total damage

Author's Note
You can probably afford to sacrifice some damage to improve the aesthetics of the build.

For example: As this is a pure-ranged buld, you could elect to use a Staff instead of the Thermal Claymore. I simply offered the highest damage bonus items for the build.