CThe Unstoppable
The Unstoppable Passive
Gain 60% (+25% Attack) more Shields from all sources. Whenever Kai gains Shields, he also gains 9 (+6 per Rank) Attack.

Hero
Tier C
Warrior
The Shotcaller
C tier on patch 0.5.12
Runs with Kai are among the least successful overall, and player lists for Red Rift rate him C. He holds up on SSS difficulty on a small sample and leads a highly rated shield strategy in Endless, where The Unstoppable is the first pick.
Picked at rank B and locked for the run. The order weighs what each one does for this hero in the comps that win, not the ability on its own.
Tiers are reviewed by hand after each patch (latest: 0.5.12), weighing the runs players share, most of them in Red Rift, the comps that clear the high difficulties, current player tier lists and recent balance changes. All 25 heroes side by side are on the hero tier list.
Kai charges for two seconds, shields himself for the wind-up, then dumps the remaining Shields into the board as damage. Anything that raises his Shields raises his damage, which is the inversion the rest of the roster does not have: on Kai, defence items are offence items.
No part of Kai's kit has changed as often as The Bold. Today it adds the Tank class and 30 Defense, makes Resolute Strike hit 1 second sooner over a larger area, and, once Stall (15) has passed, grants 100 plus 400% Defense in lasting Shields on each cast. On his 41 base Defense plus the spec's 30, that is 384 Shields per cast before rank gains.
Resolute Strike's Shields scale on 400% of Attack and 250% of Magic, its hit on 150% of Attack, raised from 100% in 0.5.4. The Unstoppable closes a loop on top: each time Kai gains Shields he also gains 9 plus 6 per rank Attack, and his 46 base Attack is second among Warriors only to Logan's 50. Shields handed out as combat opens count as gains too: Shielding Presence, a Warrior upgrade, grants 1,000 plus 500 per rank lasting Shields, and Warrior's Aegis Banner a lasting Shield worth five times his Attack.
The Intrepid wants Crits early. For Rush (6), each Crit permanently adds 1 plus 1 per rank Attack and 100 plus 200% Attack in lasting Shields, and its Backup line takes 2 plus 1 per rank Defense off the target of any Warrior Crit. Before the 0.5.3 rework the first line granted Crit for Rush (8), and 0.5.4 narrowed the new window to 6.
Kai starts at 15 Crit like every hero outside the Assassin class, so the Crit has to come from elsewhere: Warrior's Precise Reflection gives Warriors 25 Attack and 15 Crit, and Precision Lattice adds 250 Crit to each hero's first attack against every enemy.
A hero climbs C → B → A → S — 3 upgrades in all. Every stat rises at the same rate on every hero, with one exception: the primary stat of the class rises three to four times faster. For Kai that stat is Attack.
| Stats | Per rank | C → S |
|---|---|---|
| Health | +12.5% | +37.5% |
| Defence | +8 | +24 |
| Attackprimary | +25 | +75 |
| Magic | +6 | +18 |
| Attack speed | +5 | +15 |
| Crit | +4 | +12 |
| Mana regen | +1 | +3 |
Health rises as a percentage of base health; every other stat is a flat addition. The specialization is chosen at rank B, and the class modifier pools open at A and S.
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.
A hero unlocks one of these at rank B. The choice is locked for the run, and it decides which role the hero ends up playing.
Gain 60% (+25% Attack) more Shields from all sources. Whenever Kai gains Shields, he also gains 9 (+6 per Rank) Attack.
Extra classes it can gain: Tank
Gain the Tank class and 30 Defense.
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.
Picked at rank A and again at rank S. Drawn from the shared pool for the hero class, so two heroes of the same class compete for the same upgrades.
On Crit, heal 50% Crit health and gain 3 Mana.
Gain 1 Range and 40 Attack Speed.
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.
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.