Poet's Way. T H I C C Poet's Pen Boss Killer

Weapons:

Put in Body Swap with Unearth if you like. In some maps it's great, in others - not so much. Otherwise use Combustion.

Armor:

Budget option: rare chest or Belly of the Beast

Helmet:

Dex+MS+IAS. Enchant is BIG, get it. Starkonja's Head or rare helmet with DEX also works, specially if you are planning to use Body Swap to move around. GMP can be swapped for Culling Strike.

Gloves:

Dex, life, attack speed(if you need). Purity of Ice is nice for Uber Elder as cold damage is the only thing that can kill this build during that fight and helps with resists. You do need lvl4 Enlighten to be able to run it with Anger and Herald of Ash. I was using Repentance gloves(and Astramentis) for some time as well - it was pretty ok, but decided to switch off.

Boots:

I went with Bubonics, but Death's Door, Kaom's Roots or rare boots will work very well. Swap to Kaom's Roots for Uber Elder fight.

Belt:

Cooldown recovery is really nice, but not mandatory. Use rare belt with resists or Flow Untethered
Life recovery rate + cooldown recovery rate. Amazing belt if you can fit it in. Doryani's Invitation is also an extremely nice belt giving some leech, damage and resists.
Note that balancing attack speed with your cool down time is important and does not work the way you would expect. If you have base cool down time of 0.25sec you attack time can't go lower than 0.27(not 0.25) or you will start skipping every third cast of Volatile Dead. I'm not sure what is causing this, might be server ticks, but keep track of that. You want your attack time higher and as close to cool down time as possible, as long as you don't skip any casts. With 20% CDR (0.21 cool down) you can't go below 0.23 attack time. I don't know if this has something to do with latency or anything, so check yourself.

Rings:

A lot of phys mitigation and regen, some AOE and damage with ascendancy. If can't afford - use rare rings with life/res/damage or even Kaom's Sign.

Amulet:

Good stats, not mandatory. Use rare amulet or Ngamahu Tiki on a budget. Elder amulet with fire leech could be really good too, specially if you can't afford Watcher's Eye.

Flasks:

I'll be honest - i slapped on more or less random flasks at some point and never cared enough to switch them, so adjust to your needs.

Jewels:

Life/Res/Damage. Pretty expensive. Can get some cheaper with spell damage, but that's not optimal. Try to craft some yourself (i crafted most, if not all, of mine and made nice profit selling RF jewels in the process).
Leech>Penetration.