The Easyist Build Ever

Not the fastest or the strongest build but definitely the easiest.

1 Essence Drain + Contagion + Wither
Essence Drain can do enormous damage from a distance that can't be reflected.
Essence Drain is a spell so it doesn't depend on accuracy.
Essence Drain is a projectile so it can use some projectile support gems.
Essence Drain also regens life. With Zealot's Oath it regens ES.
Cast contagion on groups of weak monsters before using Essence Drain.
Use Wither after Essence Drain on tougher enemies.

2 Chaos Inoculation
This eliminates chaos damage but forces you to maximize energy shield.

3 Decoy Totem
This redirects almost all damage away from the player character.
Cast a Decoy Totem every time you meet more than a few enemies.
Try to cast a new totem just before the current one expires.
A large ES can tank the occasional crit between totems and recovers fast.

4 Vulnerability and Temporal Chains
Vulnerability increases damage-over-time and physical damage which is helpful to allies.
Temporal chains slows enemies down and makes damage-over-time last longer.

5 Golems
Fire for damage
Chaos for armor
Stone for ES regen (with Zealot's Oath).

6 Auras
Discipline and Purity of Elements. Arctic Armor in early levels.

Flasks
1x Mana flask with the "of Staunching" suffix to stop bleeding.
1x Sulphur flask for +40% damage and 4% ES regen (with Zealot's Oath).
1x Stibnite flask for Smoke Cloud.
1x Quartz flask for Phasing and dodge.
1x Quicksilver flask for increased speed.

Passive Tree
https://www.pathofexile.com/fullscreen-passive-skill-tree/AAAABAABAQFvBqAIZw18DkgPqxBYES0RLxFQEZYTbRQJFVAV1xa_
GmwbJR1PHdkfxyHDIvQkiyaIJ6krCit4LJwspiy_
LYs0CjW5NsU3ZjeDPydDVESrSRNKyEuuUq9VrlZjV8lX4VltXEBca1yKXfJfmGSEZ
_xqjGwLbRluqnWedhF2gnyDfll_xoIQguSESIauh2WHy4hCieCKr4t6j6aP-pARkNaTH5Mnna6i2abrpwinK6ebrUqvm7DYtAy00bVItzC7Tb6KvrzBxcM6w23IDMgUytPPFc8y2CTZW91f34rfsOL35ljpAuq662Pr7uwY9HH1b_fB99f5ZQ==

Most passives are for energy shield and chaos damage. The two main Keystones are Chaos Inoculation and Zealots Oath. The rest are for elemental resistances, totem duration, strength and dexterity, and Arcane Vision. The reason Scion is Better than Witch for this build is because Scion is closer to those resistance, totem, and skill effect duration passives just below her starting point.

well, this looks bad.. i like helping newcommers but you called your build somehow good so.. no mercy :)
- zealoth's oath gives you ES regen based on your hp regen, which would be extremly low for you ( like 20 hp/s from gear plus 100 from golem? what's the 120ES/s if you have 9k ES pool disappearing in 2 hits?), doesnt work with potions, even if you go for % hp reg it'd be weak cuz it's counted on your HP pool before CI (~1400 i guess ?)
- arcane vision gievs you vision based on ES instead of HP - it work's on % HP/ES you have so since your HP is 1 (always full - full vision) or 0 (you're dead) why bother ?
- you picked witch +elemental damage for crappy +15% resist ? rly ? i mean RLY ? 4 points wasted for 45% res ? get it from gear bro
- purity of elements ? dude, get some decent gear or craft it from essences and use your mana pool on soemthing that gives you real survival like blapshemy temp chain or arctic armour
- go and minmax thsi tree, you're wasting a lot of points around witch for no reason (between witch starting and ES above her), grab witch HP nodes and convert em with jewel Energy from Within for nice ES

no, it's not the easiest build - it requires you to use good gear to sustain high ES, lowers your survivability by unabling you to use flasks and would have at best averange clear speed which means you'd have to spend like 2-3 times more time (WTF english) farmign ucrrency to bring ES to some safe levels
it's not even comparable to dumb-proof triple flame/flameblast totem which clears t15 maps with 10c gear