Righteous Fire is a popular skill in Path of Exile that has gone through changes over the years. The traditional way to scale the skill was to get a big HP pool or a big energy shield pool, and based on that number, you'd get a percentage of base damage per second that Righteous Fire would deal. However, this was changed in the 3.8 patches to give a lot of flat damage per second.

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This guide will focus on building an Ivory Tower Righteous Fire character, which is a new way to scale the skill that has emerged in recent times. The Ivory Tower unique chest piece is the cornerstone of this build, as it converts all of your mana into an energy shield, effectively making your mana pool your new health pool. This enables you to scale your energy shield to insane levels and use it to fuel your Righteous Fire.

The first step in building this character is to get the Ivory Tower chest piece. This can need a lot of Poe Currency, but it's worth the investment. You'll also want to get a lot of strength, as it gives you one life per two strengths and one percent energy shield for every 10 strengths. Shaper's Touch gloves are also a must-have item, as they give you one percent energy shield per 10 strengths and are an essential part of the build's scaling.

Next, you'll want to focus on getting as much flat energy shield as possible. This can be done through items that give flat energy shield bonuses or through passive skills on the tree that give life, which is then converted into an energy shield. The trick to this build is to reserve as much life as possible to get a flat energy shield from the Blood Magic Support Gem and other sources.

You'll also want to focus on getting as much increased energy shield as possible. This can be done through the passive tree or through items like shields, amulets, and rings that give energy shield bonuses. Increased energy shield recovery rate is also important, as it enables you to recover your energy shield faster after taking damage.

Once you have a decent amount of energy shield, you can start using Righteous Fire. The skill deals a percentage of your maximum life and energy shield as fire damage per second. With the Ivory Tower chest piece, your mana pool becomes your new health pool, so you can use your energy shield to fuel the skill. The Val version of Righteous Fire is the most effective for this build, as it deals a percentage of your sacrifice life as fire damage per second. The higher your energy shield, the more damage you can deal with the skill.

In conclusion, an Ivory Tower Righteous Fire character is an excellent choice for those looking to push the limits of energy shield scaling in Path of Exile. The build is expensive but can achieve incredibly high energy shield levels and deal significant damage with Righteous Fire. With careful planning and investment, you can take this build to the next level and become one of the top energy shield characters in the game.