Botlane support, assuming your AD carry has Heal with him.
Written by a 1500 elo EU West, maining Soraka cause I'm last picking most of the time

1/6/23 is the my main setup

About Masteries:
Scout is ****
Sage gives 40 bonus exp, not worth investing imo
Greed and Wealth are core
Good Hands can be changed for Expanded Mind , if you feel the need for more mana
Hardiness + Resistance are taken for better survability
Summoner's Wrath for the 10 MRes+Armor loss from Exhaust
Change the one point from offensive to something else if you are taking Clairvoyance

Greater Mark of Cooldown Reduction even after the Infuse Change, if you have problems with the Astral Blessing costs, you can take Mp5 runes tho (shouldnt get mana problems after getting Shurelya's Battlesong)
Greater Quintessence of Movement Speed to hit 400~ MoveSpeed with Upgraded Boots
Greater Seal of Armor to avoid dieing to the enemy carry+jungler
Greater Glyph of Scaling Magic Resist can be changed to Health per level, flat health, more armor, more CD or whatever you like
You can take Gp10 Quints and Runes too

Astral Blessing and Infuse get maxed since Starcall eats mana like no tommorow.
Starcall is imo not worth skilling, it messes with your AD carries lasthit focus, pushes the lane and makes you go oom quite fast.
Infuse does deal a decent amount of damage, so you can use this besides your autoattacks for harrasing.

zeke's herald sight ward

You'll start 99% of your time with a Faerie Charm and some Sight Ward or Vision Ward.
Building out Philosopher's Stone and Boots should be your first priority. After that get a second Gp10 item.
I prefer Heart of Gold, but you can also/additionally build Kage's Lucky Pick.
Shurelya's Battlesong+ Aegis of the Legion are core and should be build next. If you like the Gp10 from your Philosopher's Stone tho, you can build a Kindlegem first and turn it into a Zeke's Herald
Ionian Boots of Lucidity or Mercury's Treads or Ninja Tabi should be bought depending on enemy team comp.
Will of the Ancients or Zeke's Herald depending on the needs.
I'm not a fan of Locket of the Iron Solari and Randuin's Omen is a bit expensive, you can buy it if you want tho.
Items after Oracle's Elixir are last item choices for higher survability.

Sunfire Aegis should be bought if you are in need of health and armor.
Rylai's Crystal Scepter provides health and AP, also adds a nice slow to your Infuse(35%) and your Starcall(15%).
Warmog's Armor for plain health. It's quite ok and you should rack up health with the assists.
Banshee's Veil is for countering initiate heroes, for example Malphite's Unstoppable Force or Sion's Cryptic Gaze.
Zhonya's Hourglass is to avoid getting focused. Yes, people will focus you if they figure out that you are keeping your teammates alive. The armor and AP are also nice.
Frozen Heart gives you tons of def, CD Reduce and a good aura. Mostly get this when carries like Vayne or Kog'Maw are around, which get a advantage of attackspeed and enemy life amount.


So, should I get Will or Zeke's?
Reasons to get Will of the Ancients:

• Teammate (mostly mid) wants it for (increased) Spellvamp [might have a Will already and wants another aura]
• Your AD Carry has already a Bloodthirster or Wriggle's Lantern and doesnt need your Zeke's Herald.
• Vladimir
• You want AP....

Reasons to get Zeke's Herald:

• AD Carry rushes Infinity Edge and Phantom Dancer, thus cant get life steal.
• Enemy Team contains champions with a Randuin's Omen or Frozen Heart.
• You want Health and CD Reducts in a support item.

Out of the two aura items, I would choose Zeke's Herald, as it helps more with the supporting aspects.

maybe ill write more