Three of these are activeabilities that you might use in battlewhile the fourth one is a passive.
With upgrades, this ability can increase the stun dealt by this ability.
you might increase the health regenerated while reducing the damage taken further with upgrades.
With the retaliation upgrade, this abilitycan also unleash a shockwave at the end.
you might increase the health he regenerates during Second Wind while also increasing the attack speed with upgrades.
Finally, the Refreshing Wind upgrade canalso make all his ability’s cooldown to go awayduring second wind.
Kai, as it might be obvious from his abilities, is the tank companion.
However, he won’t be dealing a lot of damage to aid you.
Moreover, you don’t necessarily need a tank for normal and lower difficulties.