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Chroma : He is the one usually running Unairu. The reason for that is the node "Unairu Wisp" , doubling operator Amp Damage
Wisp : https://i.imgur.com/s10KINY.jpg

Harrow/Volt/Trin : Madurai for the node "Void Strike" will allow your team to take down the shields fast as possible.

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Harrow is utilized for his ability to block the magnetic wave after every limb break, and the Retaliation critical buff he provides. Your job is to provide covenant as soon as the Eidolons are about to cast their Magnetic Wave. 95-100% duration and max efficiency are needed. I prefer high strength as well, to maximize crit gain.

Build : https://i.imgur.com/BKum95F.jpg

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Chroma is used for his ability to buff himself with Fury, a damage increase buff, that helps him oneshot the limbs.
You want to use a self damaging weapon to get your buff, before the teralyst and while waiting for the shards on the shrine in the middle of the lake.

Keep in mind; It's your job as chroma to teleport the lure after teralyst capture.
Chroma build :
https://i.imgur.com/gD8TT0k.jpg
Chroma Fast Charge:
https://redd.it/9ttso7

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Trinity is a very crucial role. You need to grab lures required for capturing. Soon as your team is ready to head out, you want to grab 7 lures.

Optimal Strategy : Help on first shield. Grab 2 lures and give them to chroma. Go back , take 5 lures, and wait on shrine.

Keep in mind, as trinity you have to teleport lures to shrine after Gantulyst and to gate after Hydrolyst.

To do that as quick as possible, get on your Itzal archwing. Go to double or a single lure camp, use penumbra, shoot it, and blink next to it. Hack and use a cipher, and move on to the next lure.
Lure locations : https://imgur.com/jm03STZ
Lure path :
https://goo.gl/veNpJg
You want to have enough ability strength to get 75% damage reduction. Get duration and energy efficiency as well.
Build : https://i.imgur.com/V9WhKAL.jpg

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Volt is the most important role in the squad. His shields buff the Amp's Critical Damage, allowing you to get the shields down easier.
You want to have max efficiency and a lot of duration. Natural Talent recommended
Build : https://i.imgur.com/8k7VKVk.jpg

Shield placement for limbs :
https://imgur.com/a/UQWTOKp

On the final phase of the Eidolon, you must stack 6 shields 30 meters away in front of the Eidolon, so that your chroma benefits from added crit damage and electricity damage.
Shield stacking : https://i.imgur.com/c8pXrkP.jpg

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Has 4 limbs.
Attacks include a arm swing, ground smash, ground stomp, starfall, homing missiles.
Requires 2 charged lures to capture. Recommended 3 charged lures at time of capture

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Has 6 limbs.
Attacks include arm swing, ground stomp and smash, God rays (spawn from the ground up, yellow smoke indicator prior to) , disco ball rays, homing missiles.
Requires 3  charged lures to capture. Recommended to have 4 lures at the time of capture

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Has 6 limbs.
Attacks include arm swing, ground stomp and smash, vomvalyst bloom summon, passive lightning every few seconds, green ground AoE, green orbs that cause a magnetic proc,
Requires 3 charged lures to capture! gg!

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Naramon's Mind Sprint
Zenurik's Void Flow
Vazarin's Enduring Tides
Unairu's Basilisk Scales (less important, focus on above)

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Regarding your operator amp, the best amp parts for hunting are :

Rahn / Granmu / Shwaak / Raplak Prism

Shraksun Scaffold

Lohrin Brace

Virtuos Shadow for the amp arcane.

Regarding Operator Arcanes (if you own any), you want to use Magus Vigor as your highest priority, Magus Husk / Replenish / Elevate

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Ciphers

Energy Pads

Archwing launcher

You absolutely want to have the Itzal archwing. It allows for great mobility , blinking, and quickly gathering all the loot , Cosmic Crush, for minimal time loss.
Build : https://i.imgur.com/7X3BasW.jpg

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Corrosive projection applies to the Eidolons. Their armor type is alloy , making them weak to Radiation (75%) and cold (25%)
You are looking to strip armor as much as possible without removing it completely, for maximum damage bonus.
The optimal setup is 3 Corrosive Projections with 2 Coaction Drifts, for a 99% armor strip.
Host uses Enemy Radar

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Your weapon should be modded for radiation damage.

Vectis Prime : https://i.imgur.com/Z7uUrqP.jpg

Rubico Prime : https://i.imgur.com/sykvBgZ.jpg (Replace high voltage with riven)

Vulkar Wraith : https://i.imgur.com/DKlNF0o.jpg

Self damage Hikou prime build : https://i.imgur.com/cXDPoeh.jpg

Self damage Cerata build : https://i.imgur.com/noaz8LH.jpg

Bring an additional weapon to be able to easily kill vomvs. Scoliac if you pick hikou, or a pyrana if you pick cerata.

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If you own any, Chroma should use Momentum / Acceleration

Nullifiers and Guardian are good for the rest of the frames (drain immunity and armor. Note that only the proc gets denied, not the damage)

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The first shield should be DPSed down using your granmu prism, an unairu wisp and the volt shield.

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Harrow and Volt DPS the first shield using wisp and shield, while Trinity moves a bit further to the back, to ensure the lures teleport

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You need to use your Operator Amp to shoot the Eidolon Shields, while shooting through the Volt shields. Preferred firing mode is the Shraksun Scaffold, as it does an high amount of damage and is able to hit multiple parts per projectile

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When the shield goes down, your Chroma/Rhino should take down a limb quickly as possible. You're free to shoot any of them, but keep in mind he'll fall down in the opposite direction and prepare for a magnetic wave

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After the limb is broken, there is a small charge-up of approximately 10 seconds, after which the Eidolon releases 5 magnetic waves. Harrow is tasked with providing protection, Chroma is tasked with providing wisps before and after the 5 waves, and volt has to position the shields in a desirable and approachable way (displayed on the volt section)

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After the 4th, and the 6th limb, the Eidolon will fall to the ground, attracting Vomvalysts and regenerating health per vomvalyst absorbed. This is the point where your Trinity has to be back with all the lures, and go inside the eidolon so that the lures absorb the vomvalysts instead.

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Vomvalyst usually spawns into groups of 2 or 3, and their spawns are scattered around the map in few locations, indicated here : https://goo.gl/R6wKtr
They have a physical and ethereal form. Physical can be killed with amp or weapon and sends them into ethereal form. Ethereal form can be only killed with amp, dropping a core upon death that can add 1 charge to lure, or instantly be absorbed by 1 lure, adding 1 charge.

A common strategy is to grab the Geyser Camp lure, and port it to the gate before everyone heading off. That prevents all the spawns from triggering at once.

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Eidolon Lures are usually found in Grineer camp and they are necessary in capturing Eidolons.
Teralyst requires 2 charged lures, Gantulyst and Hydrolyst require 3 each.
A lure can be fully charged by absorbing 3 vomvalysts each.

Teleporting lures are now a mandatory part of Trinity / Chroma.
To teleport a lure, soon as you hear the DING sound from the capture shot, get on your archwing and quickly blink to the location you want the lures teleported and touch the ground.
(Example, chroma shoots teralyst, gets on archwing, quickly blinkds to shrine.)

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It is customary for groups to run 1 precharge run and the rest normally.
On the precharge run ,void strike users precharge for 10-15 minutes, and rotate between spending charges (volt>trinity>harrow)
On the normal runs, all void strike users shoot all limbs, per eidolon, and dump charges and recharge on the healing phase