
The Right Hand
Every 5 casts, create a random item and gain 2 (+2 per rank) Shards.
The Maker
“I've got all we need here with me.”
A range-3 Mystic whose Vault Spark gives a big Shield to the ally with the lowest HP%, adding a target per 12 Mana Regen. Raise Mana Regen and Magic. The Right Hand brings items and Shards, The Lustrous Burns enemies that hit shielded allies, and The Tycoon boosts ally Max HP. Pairs with Grace's The Radiant.

Spark a protective vault. Apply 250 (+250% Magic) Shields to the 1 (+1 per 12 Mana Regen) lowest current % Max HP Heroes.
At B rank you pick one of three. Tap the cards to compare.

Every 5 casts, create a random item and gain 2 (+2 per rank) Shards.

Gains class Vanguard
On cast, gain (+33% Max HP) Shields.
Whenever an enemy damages a Shielded Hero, inflict 1 (+1 per rank) Burn on that enemy. Backup.

Every 5 casts, gain a Tycoon stack.
At start of combat, Heroes gain 75 (+4 per 1 Mana Regen) Max HP per Tycoon stack. Backup.
Specializations, upgrades and items players picked for Fiona in shared builds. Each shows the pick rate (bold), the clear rate of builds with that pick, and the number of builds.
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Picked from the game data to match Fiona's mechanics, class and the stats their abilities scale with. The tags before each item name say why.

+4 Mana Regen+25 Magic
If this item is held by a Mystic, double its stats.

+200 Max HP+8 Mana Regen
Whenever the holder applies Shields, apply 25% more.

+25 Starting Mana+4 Mana Regen+25 Magic
Whenever the holder Shields another Hero, damage all enemies equal to 50% of the Shield applied.

+25 Starting Mana+4 Mana Regen
Every 4 casts, if held by a Mystic this item gains 1 Mana Regen.

+4 Mana Regen+20 Attack Speed
If this item is held by a Mystic, double its stats.

+400 Max HP
At start of combat, the holder and adjacent Heroes gain a Shield equal to 15% of the holder's Max HP.
A and S rank upgrades are class upgrades: the options come from the hero's class, not the hero (game tutorial). In the current data the A and S rank options are the same list. S rank heroes also get one more item slot. Expand to see the options.

Mystics gain 1 Mana Regen for each reroll this game. Backup.

Every other cast, gain 3 Shards.

Backup Only: At start of combat, gain 5 Shards and give Heroes 500 (+500 per rank) Shields.

On Stall trigger, gain 1 Shard and give Heroes 3 Mana Regen. Backup.

After Stall (30), permanently gain 5 Mana Regen.

Stall abilities trigger 6 seconds faster. Backup.

When this Hero applies Shields, apply 50% more Shields.

On cast, give other Heroes (+100% Mana Regen) Attack and (+100% Mana Regen) Magic.

At start of combat, give this Hero and adjacent Heroes 400 (+250% Magic) (+1000% Mana Regen) Shields.

Backup Only: At start of combat, give Heroes 4 (+4 per rank) Mana Regen, 50 (+25 per rank) Attack, and 50 (+25 per rank) Magic.

On cast, give the lowest percent health Hero 100 (+500% Mana Regen) Shields.

On cast, permanently gain 4 Magic.

On cast, increase the amount of each Debuff on enemies in range by (+50% Mana Regen).

On cast, gain 1 Mana Regen for each type of Debuff on all enemies.

On cast, give the lowest percent health Hero 1 Shield per 2 Debuffs on all enemies.
How to read the numbers: base value (+N% Stat) adds N% of that stat, (+A per B Stat) adds A for every B of that stat, and values split by slashes (/) are per rank.