Ionia
10 champions. Ionia Star Crystals, Nova Crystals and Gemstones upgrade the constellations of 5 of them.
Ahri 
Lee Sin 
Lillia 
Master Yi 
Sett 
Shen 
Spirit Blossom Ahri 
Spirit Blossom Master Yi 
Spirit Blossom Yasuo 
Yasuo Gold ring = upgrades with Ionia crystals and Gemstones.
Ionia Star Crystals adventures ≈ 70 · each champion needs 50
- 3★
Daughter of the Void 3★ World #6 · clear with a Bandle City champion 
Silver Star Vessel - 3.5★
The Ancient Fear 3.5★ World #2 · clear with a Bilgewater champion 
Gold Star Vessel - 3.5★ The Grand Heist 3.5★ World #2 · clear with a Bilgewater champion Gold Star Vessel
- 4★
The Star Forger 4★ World #9 · clear with a Noxus champion Silver Star Vessel - 4.5★ The Unforgiven 4.5★ World #5 · clear with a Shadow Isles champion Gold Star Vessel
- 5★
The Frost Witch 5★ World #12 · clear with a Noxus champion Gold Star Vessel - 10★ With Friends Like These... 10★ Nightmare #30 · clear with a new champion Gold Star Vessel
Legend Levels 54 and 83 also give a Ionia Gold Star Vessel. All Legend Level rewards.
Ionia Nova adventures ≈ 2.8 · each champion needs 1
- 10★ With Friends Like These... 10★ Nightmare #11 · clear with a new champion 1 Nova Crystal
- 10★ With Friends Like These... 10★ Nightmare #31 · clear with a new champion
50 Nova Shards
Ionia Gemstones adventures ≈ 350 · each champion needs 1000
- 10★ With Friends Like These... 10★ Nightmare #45 · clear with a new champion
Major Gemstone Vessel - 10★ With Friends Like These... 10★ Nightmare #56 · clear with a new champion 100 Gemstones
Gemstone Vessels also come from the Glory Store (pick Ionia), the Emporium and Legend Level 74; regional Gold Star Vessels from the Glory Store and Legend Levels. All sources.
Rewards your Ionia champions can claim
Adventure rewards that need a Ionia champion to clear the adventure.
- 2★ The Spear of Vengeance 2★ Blossom #8 · clear with a Ionia champion 10 Star Crystals
- 2.5★
The Machine Herald 2.5★ World #7 · clear with a Ionia champion 
Platinum Vault - 2.5★ Blossoms and Mushrooms 2.5★ World #2 · clear with a Ionia champion Platinum Vault
- 2.5★ Blossoms and Mushrooms 2.5★ World #5 · clear with a Ionia champion Platinum Vault
- 2.5★
The Desert Rose 2.5★ Rogues #4 · clear with a Ionia champion 
Silver Vault - 3★ The Collector of Souls 3★ World #7 · clear with a Ionia champion Silver Star Vessel
- 3★ The Dragonsire 3★ World #4 · clear with a Ionia champion Silver Star Vessel · random region
- 3★ The Iron Revenant 3★ Titans #4 · clear with a Ionia champion
Gold Vault - 3.5★
The Colossus 3.5★ World #8 · clear with a Ionia champion Silver Star Vessel - 3.5★ The Ancient Fear 3.5★ World #5 · clear with a Ionia champion Gold Star Vessel
- 3.5★ The Grand Heist 3.5★ World #5 · clear with a Ionia champion Gold Star Vessel
- 4.5★ The Unforgiven 4.5★ World #3 · clear with a Ionia champion Platinum Vault
- 4.5★ The Unforgiven 4.5★ World #4 · clear with a Ionia champion
1000 Stardust - 4.5★ The Wrath of Zaun 4.5★ Arcane #3 · clear with a Ionia champion Gold Vault
- 4.5★ The Lady of Luminosity 4.5★ Teamfight #5 · clear with a Ionia champion Gold Vault
- 5★ The Frost Witch 5★ World #10 · clear with a Ionia champion Gold Star Vessel
- 5★ The Noxian Grand General 5★ World #4 · clear with a Ionia champion 1000 Stardust
- 6★ Blossoms and Mushrooms 6★ Blossom #2 · clear with a Ionia champion 40 Star Crystals
- 6.5★ The Star Forger 6.5★ Arcane #3 · clear with a Ionia champion Gold Vault
- 6.5★ The Grand Heist 6.5★ Rogues #4 · clear with a Ionia champion Gold Vault