This build need some budget, so it may be not suitable for league starter, but if you are finding a powerful and tankly Scion Elemental Hit build, just try it!

Quick Jump

Pros & Cons

Skill Tree 

Ascendancy

Slayer - Raider - Path of the Duelist

Alternatives: Raider could be swapped for Pathfinder, Elementalist, Juggernaut, Inquisitor, Chieftan, or Berzerker for individuality sake!

Bandits

Kill them all. Help Alira if you want to go down the Crit path.

Pantheons

The Pantheon List

• Major God – Soul Arachali with 50% increased Recovery of Life and Energy Shield if you've stopped taking Damage Over Time Recently
  Check out section 'Tips and Tricks'  to see how we do this consistently!
• Minor God – Gruthkul for mapping Yugul for Uber Elder

Passive Tree

PoB Link: https://pastebin.com/5NKzd3Mb

Gems Setup

Elemental Hit

Single Target: Elemental Hit - Elemental Damage with Attacks - Combustion - Mirage Archer - Fire Penetration - Damage on Full Life

Clearing: Elemental Hit - Elemental Damage with Attacks - Greater Multiple Projectiles - Combustion - Mirage Archer - Fire Penetration

Auras

None! This is a Blood Magic build. Before picking up the keystone: Anger/Flammability-Blasphemy/Herald of Ash/Arctic Armor can all be considered.

Utility

Other Nice to Haves

Vaal Grace: Some extra survivability for bosses.

Vaal Haste: For all the speed demons.

With any of these Vaal Skills consider linking to Increased Duration!

Quality Priority

Elemental Hit > Damage Supports (All give .5% increase) > Attack Speed Supports (GMP)

Gear

For a more detailed selection of gear, please refer to the PoB Link. The gear selected in the PoB is not mandatory if it is not stated. It is recommended that the player check the affix of the gear and make a better choice.

Stats for gear

Helm: Stats to look for: Life > Resists > Int

Chest: Stats to look for (if you're using a rare): Life > Resists

Weapon: Stats to look for (if you're using a rare): + Gem Levels > Attack Speed > Elemental Damage with Attacks (% or flat damages) > Utility (charge generation, chance for double damage, etc.)

Quiver: Stats to look for (if you're using a rare): Life > Attack Speed > Elemental Damage with Attacks > Utility (Movespeed, Pierce, Point Blank)

Gloves: Stats to look for (if you're using a rare): Life > Resists > Attack Speed

Belt: Stats to look for (if you're using a rare): Life > Resists > Increased Flask Effect Duration/Increased Flask Charges Gained

Boots: Stats to look for (if you're using a rare): Movespeed > Life > Resists/Int > Open Prefix to craft Elemental Damage with Attacks

Amulet: Stats to look for (if you're using a rare): Life > Resist > Elemental Damage to Attacks

Rings: Stats to look for (if you're using a rare): Life > Resists > Elemental Damage with attacks > Attack Speed > Flat Ele Damage

Flasks: Look for Increased Duration and removal of Bleed/Freeze/Curse.

Jewels: Stats to look for: Life > Attack Speed > Damage

Leveling

These items can be useful while leveling: Goldrim, Tabula, Wanderlust, Prismweave, Silverbranch, Hyrri's Bite, Storm Cloud, Quill Rain, Lochtonial Caress, Karui Ward, Call of the Brotherhood, Pyre, Elreon -Mana Cost jewelery (resists/int a plus!), and buying skill/support gems with quality ready to be socketed in!

IMPORTANT: You cannot level as Elemental Hit without the Combat Focus Jewels.

Alternatives: If you have a favorite way of leveling (Abberaths Hooves, Poets Pen, Sunder, etc.) then do that!

Low Level Tree

Rush Avatar of Fire and Resolute Technique for the switch to Elemental Hit. Early game it's standard bow leveling.

• MainSkill: Ice Shot - Volley - Added Cold - Mirage Archer - Added Lightning - Onslaught - Pierce
• Mobility: Blink Arrow - Faster Attacks
• MainSkill (Replaces Ice Shot): Elemental Hit - Volley - Mirage Archer - Added Lightning - Added Cold - Onslaught

When in Doubt Life it Out

Pick up Lava Lash and start grabbing more life to make leveling smooth. The normal lab doesn't really do much for us so we can forgo that. As you get the ability to throw on Call of the Brotherhood and Pyre those items will really boost up your base damage.

• MainSkill: Elemental Hit - Greater Multiple Projectiles - Mirage Archer - Elemental Damage with Attacks - Combustion - Fire Pen
• Aura: Anger

Normal and Cruel Lab

While normal Lab doesn't really do much for the character, getting access to Slayer Overleech is huge for survivability. Picking up Vitality Void and the mana leech node underneath is great before we get to Blood Magic. Point Blank and Acro are next on the priority list.

• MainSkill: Elemental Hit - Greater Multiple Projectiles - Mirage Archer - Elemental Damage with Attacks - Combustion - Fire Pen
• Utility: Cast When Damage Taken - Blood Rage - Immortal Call - Vaal Cold Snap

The Blood Rage needs to be before Immortal Call in the CWDT setup. The order is top left in a clockwise circle to bottom left.

Final Skill Tree

Tips and Tricks

Boss Killing

Get close with Chil Sol. It should be obvious when you read the item but you need to get really close for the massive MORE multipliers of Point Blank and Chin Sol. Use the massive life pool and slayer overleech to tank content but make sure you keep attacking.
Upgrade your pantheon! The rate of leech is huge!

Soul of Arakali and Blood Rage

If you have a Cast When Damage Taken Blood Rage Immortal Call setup you can force the "stopped taking Damage Over Time Recently" upgrade
The Order of the gems in your Cast When Damage Taken setup matters! Make sure Blood Rage is before Immortal Call where the order is Top left first and Bottom Left last.

Your Blood Rage can be over the level just make sure you manually cast it!