The great thing about Path of Exile is that the potential for new character builds is almost limitless, and more are coming out as patches and updates are implemented in the game. There is an overflowing fountain of information related to the game coming from the community, and you can even come up with one yourself. Character builds are made for a variety of purposes, whether for farming or for making the most of an active or passive skill. There is usually a theme that a character build follows which makes it interesting.
However, there is seldom a build designed specifically for killing a particular enemy, such as this one. If you have had some significant trouble with completing the Sacrifice of the Vaal mini-expansion, then you may want to give this build a try, which was made to kill Atziri, Queen of the Vaal. She is a powerful boss that caps off the first mini-expansion ever on Path of Exile, but she also has some weaknesses that can be exploited with this specialized character build that should be fun to play for those who like to chase goals in a game like Path of Exile.
The thing about such a build is that it must not only be good against Atziri, but also the monsters that the player will encounter along the way. The good news is that the content in Sacrifice of the Vaal is specialized, so this build is definitely made specifically to tackle the challenges in this mini-expansion, and you won't have to spend so many Exalted Orbs to get there. As the title suggests, it mainly uses Righteous Fire and Incinerate to hit hard and fast with lots of fire damage.
The main damage skill for this build is Incinerate, supported by Added Cold Damage, Spell Echo, Faster Casting, Fire Penetration, and Greater Multiple Projectiles. Against regular monsters, it's possible to exchange Added Cold Damage for Faster Projectiles for better results as it substantially increases the area incinerated.
There is also Righteous Fire, which is supported by Concentrated Effect, Increased Area of Effect, and Increased Burning Damage. This skill does two things for this build, which is to heavily damages enemies next to the player and provides a large bit of damage boost. It does have a drawback though of inflicting fire damage on you as well until you go all the way down to 1 life, which is something that must be considered when planning a build that uses it.
Most builds that make use of Righteous Fire pile on life and fire resistance in order to counteract this, as well as the Purity of Fire aura. However, there are a lot more items and skills needed in order to reach equilibrium with the damage taken from Righteous Fire. That's where the Rise of the Phoenix unique shield comes in as it adds a lot of fire resistance to the character, which increases as life reaches 25% and lower, as well as not being ignited when you're at low life.
With these two skills combined, along with the Path of Exile items considered for this build, Sacrifice of the Vaal can become much easier to complete as a result.