Gear: It's really simple and easy to gear this character, you just want Life/resist and rarity on every single piece. %inc fire damage is nice on rings, but it's a small boost and not needed. Also keep in mind, strength is always a good suffix because it provides life, you have a lot of free affixes on this build.
You're also going to stack both ward and life, to get the highest amount of ward you want to use Tier 1 bases of any hybrid base. I prefer ES/Armour or pure int bases, just to give us the highest pool. Armour is not that effective until you start actually starting it so just focus on pure life/ward
Morior Invictus (life) is a great chest option, specially if you can pickup a 5 socket one with life per socket, combined with
Perfect Body Rune you can get a ton of life. Other good options with life would be all resist, chaos resist or spirit.
If you need spirit you can also use
Soul Core of Azcapa in your crossbow.
Blackflame is another item you can go for, we bypass the downside and get a massive ignite magnitude. It's a good early pickup, but eventually you would want to replace it with a triple rarity gold ring. If you do use black flame, make sure you also use
Withering Presence.
Amulet: You can go for a
Cast on Dodge
Absent Amulet amulet, as this will provide even more dodge roll distance with our global quality, use the same links as the regular cast on dodge setup. The other option is using a
Gold Amulet, which will be a lot cheaper as well.
Dousing charm: This is pretty important and a must have. If you get ignited, that ignite can spread to your oil grenade and brick your snapshot (you'll do 0 damage). So make sure to always use this charm.
Anoint:
Paragon is the best anoint.
At this point you can start making your 5 prop jewels, these will give a massive amount of damage:
Ideal 5 prop:
Prefix 1: Mag of ailments you inflict 15%
Prefix 2: Ignite magnitude 15%
Prefix 3: Spell dmg or elemental damage (% armour or %Es can also be good if you scale your build for those).
Suffix 1: +1 prefix modifier
Suffix 2: Damaging ailments deal damage 7% faster