[1.2.0] Dominus + All Maps MF Dual Striker

Weapon: Wings of Entropy (the higher physical roll the better) - later replaced by Soul taker + rare offhand
Helmet: Bringer of the rain (later replaced by MF helm with defensive particular stats)
Body Armour: Only used on later stages. Belly of the Beast is probably the best option if you dont need a lot of resists on it. Or a rare (EV, AR , EV+AR) with Life + resists or stats if you need them.
Gloves: Aurseize - cheap and good option. Replace if you feel that you dont need the rarity on it and want to use particular stats
Boots: Goldwyrm - up to 20(30 in standard) + 40-50 fire resists on EV base boots, one of the best options for any MF build.
Belt: Rare belt with Life + resists that satisfy your needs (better on a rustic sash for more physical damage) later replaced by Perandus blazon for stats, item quantity and 20 fire resist
Amulet: Stone of Lazhwar - Block chance applied for spells (great with WoE + BoR), Int (for auras), Cast speed for your enduring cry if you choose to cast it manually
Rings: Rare rings with Life + resists or any mods that you might need (dont put stats that you need on them because you will be swapping them to andvarius for dominus 2nd phase)
Flasks: 2x Life flasks with mods you like (I like 1 instant recover flask and 1 fast recovery over time, one with remove bleeding and other with dispel Freezing, Divination MF flask, Rumi's Concoction Granite flask (for block after you replace WoE + BoR, Atziri's Promise (DPS + Leech) for dominus or Granite flask with mods you like for Maps for greater survivability

The gem setup is quite simple.
WoE (or dual 1 handers) + rare helm and chest: Dual Strike, Multistrike, Melee Splash, Blood magic - Melee physical damage if 5L, added fire damage if 6L

WoE + BoR: using Bringer of rain for your main attack: Dual strike - Multistrike - Melee splash - Blood magic

Soul taker + BoR: Dual Strike - Multistrike - Melee splash - Added Fire damage

(Keep in mind that melee splash is for the aoe damage, if you want you can put another DPS gem for single target, but I just keep melee splash all the time)

Soul Taker + body armour: Dual Strike - Multistrike - Melee Splash - Melee physical damage - Added Fire damage (if 5L) - Faster attacks (if you have 6L)

Other gems:
- Leap Slam + faster attacks + Blood magic (if WoE), or only leap slam + faster attacks if soul taker
- Blood rage + blood magic (I like faster casting with it)
- Enduring Cry + blood magic + faster casting

Auras: once you can sustain 2 60% auras, Hatred + Haste (for dominus) or Hatred + Grace (for more survability on maps). Until then use whatever you need more.

*1.2 Update: Hatred + purity of Ice works too for dominus, but I prefer Haste for more attack speed (dps and faster leap slams)

For general I really like Vaal cyclone with life on hit and reduced duration (so you dont keep trapped spinning forever)

What character to choose?
The build is better for Duelist, because it goes to both sides of the build. However, it can be played by Marauder or Ranger by connecting the 2 sides spending one extra passive point (8% mana node between the 2 starting sides of the duelist)

Leveling can be different for everyone. When I made the build, I used dual strike with swords and axe all the way until I got the core items to start farming, which was level 78.

I believe that level 75 is a good level to start farming dominus if you have the items (or just do maps until you can afford them)

Okay, lets say you got to level 75 and you got the core items you need to start farming: Wings of Entropy (you dont need 5 or 6 links for the item, 4L are enough), Bringer of Rain, Stone of Lazhwar, Aurseize gloves, Goldwyrm boots (swapping for Wheel of the Stormsail or Reaper's pursuit for culling with IIR gem). These are the items you should be looking for before start to farming dominus.
Rings + belt: any that will help you improve your survivability (Life + resists).

Once you get some money, buy 2 andvarius to swap for dominus phase two and a Divination Flask, these will improve your MF by a LOT.

then, FARM A lot! Specially on new leagues that many of the unique drops have a great value for selling (lightning coil, cloak of defiance, geoffri's crest, carcass jack, etc etc..)

If you ever become bored of doing dominus runs, running some maps and do some more leveling will help you to release some of the stress.

As you farm and get more and more money, you can improve the build by buying some better items that will help you farm faster and faster.

Replacing Wings of Entropy:
Once you have enough money, buy a Soul Taker and a good offhand, the more dps the better (best option is a 1 handed axe, so you can put more axe nodes since you already will be using soul taker). This will greatly improve your build by:
1: DPS wise (you should be running blood magic gem for your dual strike before it, you will no longer need it)
2: Mobility: Soul taker is a faster weapon than wings of entropy and with all the attack speed nodes you will get from the passive tree, your leap slam will be much faster, allowing you to run faster to dominus and do more runs over time.
3: By having your mana zero while attacking (considering you have a little mana left after using Hatred and Haste/Grace, your divination flask (you should have one by now) will be running for the full duration

By replacing your wings of entropy, you will be losing some block. Then, get a Rumi's Concoction Granite Flask to make up for the block loss (this will be enough after you replace your bringer of rain too).
At this point, you can also change your Amulet for anything that you might need such as resists for capping, life, int for running gems, IIR + IIQ ( I always try to have the maximum possible IIR and IIQ )

Replacing your Bringer of the Rain:
Bringer of the Rain can probably be the last item you want to change for some reasons:
1: It gives a really good DPS by supporting your main skill with Faster attacks, melee physical dmg and blind, flat phys damage, specially on new leagues that your gems will not be 20/20 so soon.
2: Block - 15% block is HUGE! and so is the life on it.
3: you dont need to worry about getting a body armor piece early.

However, as it is a MF build, you always want MORE mf! Either IIQ + IIR or just IIR if you are playing a new league.

Also, if your gems are good leveled already, you can try getting a 5-6L body armor and improve your DPS by a lot with soul taker.

A good combo that I like is a Belly of the beast (easy to get colors you need for dual strike and great for 1.2) + helmet (better being EV or AR+EV) with Life, Double IIR Rolls, Chaos resist(for blood rage, since) Int (need Int for IIR gem, specially when you replace stone of lazhwar). You can also get some resist that you might be missing.

Replacing your belt: At this point, once you get a good body armor piece, you should have some resists on it (10-15 all if you have belly of the beast) you can get a Perandus Blazon belt for 8(12 on standard) quantity + 20 fire resist + 20-30 attributes, which is great if you dont need more resists

Standard dominus runs(second run under 2 minutes):
https://www.youtube.com/watch?v=6zNwGZy50_k

Casual 75 map fast clear:
https://www.youtube.com/watch?v=zW6_fVafez8