Solo & Support Incinerate Scion

At this point, I don't have a "Leveling Path" set up yet. I can say that I went for Ballistic Mastery and Iron Reflexes relatively early, and grabbed Sovereignty and Eldritch Battery later. In the future, I'll try to add detailed instructions on how to level up. For now, I'd like to discuss some of the key aspects of the tree and explain their relevance.

Path of the Savant: This is the only spell damage node taken on the entire tree. If it weren't for the other great stats that it provides, I probably wouldn't have it. However, the Intelligence and Mana basically translate into defence, so this is a great node overall.
Shaper: This build focuses on auras, so the mana path is a great way for us to exit the Scion start. The health regeneration is quite nice as well, since we won't be making into the Duelist or Marauder areas of the tree.
Inner Force: Both our auras and Arctic Armour are effected by this great node.
Purity of Flesh: Tied with Thick Skin for the highest %life, this node gives us much Chaos Resistance as well! This will help let us run Blood Rage once we've got some Chaos Resistance from gear.
Sovereignty: This aura cluster is great for any build using multiple auras. Since we're using 5-6, this is a no-brainer.
Holy Strength: This is a great node for 3 reasons. It gives us some much needed life, strength (scarce since we don't visit the bottom-left part of the tree), and Increased Effect of Buffs.
Elemental Adaptation: A great node for any build that's in the area. This works well with our Purity auras to push our resistances even higher into the 80s.
Harrier: Great node for both cast speed and movement speed.
Mana Geyser: Pumping our maximum mana and mana regeneration as high as possible is always a great idea for this build.
Charisma: Another good aura cluster that's perfect for us.
Ballistic Mastery: This is an absolutely incredible node for Incinerate. The projectile speed here coupled with quality on the Incinerate gem gives us the freedom to drop Faster Projectiles from our Incinerate spell making way for better damage gems like Added Chaos Damage and Faster Casting.
Heart of Oak: This node is a must if you don't have access to/choose not to use Kaom's Roots. We're no where close to Unwavering Stance, and since we're sitting out in the open 99% of the time, a chance to not be stunned is great!
Leadership: Not a great node for solo play. However, if you are in a dedicated group, you should always take this node as your auras are guaranteed to be better than those of your allies.
Conduit: An underused node that has great potential for us! Theoretically, we could use Romira's Banquit, Blood Rage, and Enduring Cry to give Power, Frenzy, and Endurance Charges to our party members.
Clear Mind: A great node for any non-CI characters in the area.
Mental Acuity: Incinerate has 0% base critical strike chance, so we don't benefit from the critical strike chance, but the other stats are great. Also, this opens up the great 12% life nodes for us.
Influence: Once again, this build is all about auras, so this node is a must.
Written in Blood: Similar to Holy Strength, this node gives us some much needed life and strength.
Deep Wisdom: If you find yourself needing that little extra bit of mana, consider taking this node.
Eldritch Battery: A cornerstone for the build. It isn't necessary to take until Merciless difficulty, but once you're able to run the Discipline aura, this node will greatly increase your mana pool and regen.
Reflexes: This is the gateway to the bottom-half of the tree. Since we're taking Iron Reflexes and wearing only evasion gear, this directly translates into increased armour.
Thick Skin: More life! Can't go wrong taking this node.
Iron Reflexes: Since this build doesn't focus on blocking, turning all of our evasion into armor gives us a nice and steady amount of physical damage reduction.
Mind Over Matter: The second cornerstone of the build. This Keystone is located on the Cloak of Defiance body armour and is a main source of damage reduction.

Purity of Fire - to deal with reflect as well as high fire damage monsters like Exiles and high level map bosses (Crematorium, Shipyard)
Purity of Lightning - to deal with Lightning Thorns and high level map bosses (Piety, Dominus)
Haste - crazy cast speed due to all the aura effect nodes
Discipline - insane mana/mana regen
Clarity - insane mana regen

Here are my defensive stats using this setup:

This depends on your party. You can run the Purity auras with Grace for defence or you can run Anger, Wrath, and Haste for damage. You can determine a good mix for your own party. You should be able to support Clarity in any setup.

Cast when Damge Taken - Enduring Cry - Immortal Call - Increased Duration
CwDT lvl 7, Enduring Cry lvl 9, Immortal Call lvl 8 is a good setup, or you can just run CwDT - Enduring Cry if you don't have the space for a 4-link
Lightning Warp - Reduced Duration - Faster Casting
Curse 1 - Curse 2 - Increased Area of Effect
I'm currently running Elemental Weakness and Enfeeble
Blood Rage
With high enough Chaos Resistance, Blood Rage can be used to generate Frenzy Charges for additional cast speed

Kaom's Roots
These can be used to make you immune to stun, but you lose the sockets and movement speed.
Voideye
A level 25/26 Arctic Armour will greatly reduced the damage you take from physical attacks, potentially letting you spec out of Iron Reflexes, saving you many points.
Atziri's Promise
I will probably buy one of these tonight. The extra damage is great and the leech will work with your Added Chaos Damage gem.

Map mods to look out for with this build:
Emanent - Area is inhabited by ranged monsters
This is more annoying than dangerous. Incinerate with GMP works very well against monsters in melee range, but not so great against spread out enemies. This map might take a little longer than others.
Freezing - Monsters deal x% extra Damage as Cold
For a map like this, I'd run Purity of Ice to negate the extra daamge
Hexproof - Monsters are immune to Curses
Fire resistant monsters might take longer to kill, while high damage monsters might be a little dangerous without Enfeeble
Incombustible - +x% Monster Fire Resistance
Monsters will take longer to kill than usual
of Hemomancy - Players have Blood Magic
Nope
of Smothering - Players recover Life, Mana, and Energy Shield 50% slower
I haven't tried this yet because I haven't had to. As long as there aren't any serious damage mods, you should be able to sustain AA and MoM with this mod. If not, you could consider running a lower level of AA.
of Statis - Players cannot regenerate Life or Mana
Nope

5/20/14: Updated gear (new boots, ring, weapon)
5/27/14: Updated gear (6L chest, atziri flask)