[1.3.x] Piscator's KB Ele Wander

Chestpiece: Kinetic Blast - GMP - Power Charge on Crit - Weapon Elemental Damage - Life Leech - (Faster Attacks/Additional Accuracy/Increased Crit Damage/Pierce/Chain)
Note: Haven't done testing to determine which 6L gem is best. Currently I'm using an Ele Weakness curse in the unlinked 6th socket.

Helm: Reduced Mana - Wrath - Anger - (Clarity/Herald of Ice)

Gloves: Elemental Hit - Increased Crit Damage - Faster Attacks - Weapon Ele Damage

Boots: Cast when Damage Taken - Enduring Cry - Immortal Call - Increased Duration

Weapon: Reduced Mana - Herald of Thunder - (Herald of Ice/Clarity)

Shield: Lightning Warp - Reduced Duration - Arctic Armour - Note: if possible, don't link AA to reduced duration, since it reduces the duration of the ground ice.

Required uniques:
For leveling, any rare or even blue wand that has a decent base attack speed and ideally some crit, attack speed, and/or flat elemental damage will work. Piscator's is basically best in slot, barring some crazy mirrored wand later on (or switching to phys, but I don't plan to).

Until you get an Alpha's Howl, you can just use any rare helm. You'll have to go without one aura or herald until you do. RRBB would be technically the best colours, but I don't care enough to get them since the extra level on clarity won't actually gain me much at this point (I don't run out of mana).

Maligaro's Virtuosity are best in slot, barring getting your hands in a set of Atziri's Acuity. If you do, you can then drop Vaal Pact and use the points to go for Inner Force instead.

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Rare Armour:

Especially noteworthy is the shield - ideally you want all the stats you see on this one: life, high ES, mana regen, and resists. I was pretty lucky to get mine.

The chestpiece is fairly flexible, I just alt-regal-mastercrafted a white 5L. Any well rolled rare will do here, but I prefer Evasion/ES if possible. Evasion helps against reflect, and ES = mana.

Boots are flexible, but get lots of movespeed if you can.

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Jewellery:

Apart from capping your resists, your jewellery can be a big source of damage. After resists, prioritize crit and WED on your amulet, WED on your belt, and mana regen and flat elemental damage on your rings. If you get regen on both rings and shield, you can easily run a level 21 Arctic Armour (or higher if you want to cram in an Empower).

Current tree at level 91: Link

Normal: Oak
Cruel: Kraityn or Skillpoint
Merciless: Alira

Mana: Once you have all 3 auras and 2 heralds running, the tolerance for your unreserved mana is very thin. If you don't have enough ES from gear or mana from the tree, you may not be able to run a high level clarity and still keep enough unreserved mana to use your abilities. Be careful when leveling your AA and Clarity.

Singletarget: From my tests and calculations, I definitely would go with Elemental Hit for endgame. The quality bonus (crit chance) and flat elemental damage granted give it the highest DPS of any option here, but that requires you to get a 20/20 gem, and it costs a fair bit of mana. Until you do that, either Power Siphon or Barrage will work fine as a pure singletarget option.

You can also shotgun enemies with Kinetic Blast if they're foolish enough to stand against a wall, which is cool.

Reflect/Vaal Pact: Phys reflect is a complete non-issue, since you deal 0 physical damage. Ele reflect really starts to hurt in Merciless and maps, so Vaal Pact is necessary once your damage starts getting high. I'd aim to have it by your mid-70s or so. As mentioned in the Gear section, if you get Atziri's Acuity, drop VP and go for Inner Force with the savings.