Lux: Illuminated
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Lux-I is a board based champion focused on the 'Support' mechanic, using it to buff allies and stack Spirit and Impact.
At maximum investment, she is very good at OTKs, often overkilling the nexus by hundreds of damage through Impact stacks alone.
Her game plan can be a bit fragile though. As a board based combo champion, she needs multiple pieces on the board to activate her support effects, so her game plan can be vulnerable to disruption. This can feel especially bad because she has limited defensive tools.
Grants additional mana. 'Crownguard Inheritance' is another option here if you don't have Baton.
Dramatically increases the amount of Spirit and Impact gained.
Hopefully draws Lumiosprite.
Strategy
Lux-I wins in one attack when she has three units on the board, supporting each other like this:
Lux -> Lumiosprite -> Any Unit.
With 4 starting mana, you can play any 1 cost unit, then Lux to get a free Lumiosprite and set up the combo.
Community builds recorded for clearing the 10-Star Zoe Adventure with Lux: Illuminated
- level: 38Players:HPDARKNazoriccyclonus101+
- level: 35Players:HoodedTwoStickmen
- level: 36Player:Huffy
Counts as 'targetting' for her constellation abilities, granting Sprit and Impact alongside the normal free keyword from hexcore.
Grants Lux's supported ally Elusive, often preventing them from dying in the attack.
Light Guides Us
When an ally is targeted or supported, grant it
Spirit.
Inspiring Presence
+1 Starting Mana. Round Start: Create a Prismatic Barrier in hand. If you already have one, reduce its cost by 1.
Light Guides Us II
When an ally is targeted or supported, grant itSpirit and 
Impact.
Crush
Allies have
Overwhelm.Review
The 'Crush' power is exceptionally strong, especially since Lux ends up with very large stats. Without it, you would need to dedicate a relic slot to an overwhelm granter like The Beast Within.
Manaflow
Game Start: Get a mana gem.Review
Starting out being able to play Lux on turn 1 is extremely strong given how much of her game plan relies on aggressive tempo attacking.
Lady of Light
Each round, the first time you attack, refill 1 mana for each attacking ally and draw a spell.Review
This is a decent upgrade, but by no means transformative or required. Lux doesn't attack with that many units, and the mana comes too late to really make a difference.
- Lumiosprite
Lumiosprite is the best card in Lux's deck by far, and is an extremely important combo piece. You want as many copies of it in your deck as you can get, and you want to cut the other 2 cost cards to ensure Found Fortune grabs it.
- Ephemeral Synergy
Ways to cheaply summon ephemeral copies of allies are extremely strong, such as Shadow Totem on Lux. Always position the ephemeral to the left of the real copy, so the support stat buffs apply to the non-ephemeral unit.