
The Unstoppable
Gain 60 (+25% Attack)% more Shields from all sources.
Whenever Kai gains Shields, he also gains 9 (+6 per rank) Attack.
The Shotcaller
“Don't have all the fun without me.”
A melee Warrior whose Resolute Strike gains a Shield scaling 400% with Attack and adds area damage equal to the Shield left. Stack Attack. The Unstoppable gains Attack with every Shield, so it pairs with Pollen and Gustav, who shield every second; The Bold gives faster casts and permanent Shields, and The Intrepid grows Crit during Rush.

Charge up a mighty attack, gaining 300 (+400% Attack) (+250% Magic) Shields. After 2 seconds, deal 100 (+150% Attack) damage plus bonus damage equal to Kai's remaining Shields to surrounding enemies.
At B rank you pick one of three. Tap the cards to compare.

Gain 60 (+25% Attack)% more Shields from all sources.
Whenever Kai gains Shields, he also gains 9 (+6 per rank) Attack.

Gains class Tank
Resolute Strike hits 1 second faster and affects a larger area.
On cast after Stall (15), gain 100 (+400% Defense) lasting Shields.

On Crit for Rush (6), permanently gain 1 (+1 per rank) Attack and 100 (+200% Attack) lasting Shields.
Whenever a Warrior Crits reduce their target's Defense by 2 (+1 per rank). Backup.
Specializations, upgrades and items players picked for Kai 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 Kai's mechanics, class and the stats their abilities scale with. The tags before each item name say why.

+15 Crit+25 Attack
On combat survival, if held by a Warrior this item gains 12 Attack.

+15 Crit+25 Attack
If this item is held by a Warrior, double its stats.

+20 Attack Speed+25 Attack
If this item is held by a Warrior, double its stats.

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

+60 Defense
At start of combat, the holder gains a Shield equal to 250% of their Defense.

+75 Attack
The holder counts as a Warrior during combat. If they were already a Warrior, they gain +25% Attack.
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.

On Crit, heal (+50% Crit) health and gain 3 Mana.

On Crit, permanently gain 2 Attack.

For Rush (10), gain +100% Crit.

Rush abilities last 3 seconds longer. Backup.

Gain 100 Attack and 20 Omnivamp.

On combat victory, Warriors permanently gain 25 Attack. Backup.

On damage dealt for Rush (8), gain lasting Shields equal to 50% of the damage dealt.

This Hero's auto attacks gain 150 Crit.

For Rush (8), gain +100% Attack.

Gain 1 Range and 50 Attack.

Warriors gain 2 Attack per Rush trigger this game. Backup.

At start of combat, Warriors gain 1000 (+500 per rank) lasting Shields. Backup.

Gain 2 Omnivamp and 2 Crit per 1% of this Hero's missing health.

This Hero gains 1 Attack per 8 Shields it has (Max Bonus: 1000).

At start of combat, if this Hero is adjacent to exactly one other Hero they both permanently gain 33 Attack.
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.