Phainon Guide

>Set
Wavestrider
>Planar
Arcadia >= Rutilant (~2% Diff)
>Cone
Signature > Hertacone
Signature gives him Base SPD which is important for his ultimate, Hertacone is a 20% DMG loss.
>Relic Stats
Body: CRIT Rate/DMG
Boots: ATK%/SPD
Orb: ATK/DMG%
Rope: ATK
With S1 he only needs SPD Boots to hit 136 SPD, the choice of ATK boots depends in your supports.
Pick Orb based on substats.
>Stat Goals
ATK: 2500 ~ 3300+
SPD: 111 (Base) / 136 (SPD)
CRIT Rate: 80%+
CRIT Damage: 200%+
>Teammates
BiS: Sunday & Bronya
Sunday&Bronya Builds: SPD Boots Phainon with 135 Sunday and 134 Bronya (Sacerdos), ATK Boots Phainon with 161/160 Sunday and Bronya (Sacerdos) or the tryhard Eagle/Vonwacq Setups.
Hyperspeed non-DDD: 157 SPD Bronya (Sacerdos+Vonwacq) 165 SPD Sunday (Eagle+Vonwacq); Bronya opens with a basic attack.
Hyperspeed DDD: 151 SPD Bronya (Sacerdos+Vonwacq) and 160 SPD Sunday (Eagle+Vonwacq); same as above.
Sunday preferably has his signature cone, second best option is Dreamville Adventure.
Bronya is either holding DDD or her Signature.
The difference between setups is purely cycle autism, the 136/135/134 & 161/160 setups are best for casual usage.
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4th Unit: RemMC, Tribbie, Robin, Sparkle, Ruan Mei, Tingyun, Cipher OR any Sustain
Their builds dont really matter and you build them as you normally would (i.e Tingyun 174 SPD with Vonwacq, RMC with 165+ SPD Vonwacq, etc)
If you use Robin you want to use her ult and then use Phainon's ult immediatly after, the AV will be stored into the next wave, this way your supports will take action as soon as Phainon ult ends.
Cipher doesn't provide any stacks but her Vuln% and DMG Store mechanics work inside Phainon's territory.
If you use Sparkle place her between Sunday and Bronya, any cone.
Ruan Mei can alleviate SPD Goals.
RemMC can hold any core, Shadowburn helps with SP.
Tingyun makes for a great DDD holder.
>Vertical Investment
E2 > S1 > E1
E2 is priority, otherwise S1 > E1.

Feedback is welcomed.