Assassin
Assassins use Crit to deal bursts of damage with their auto attacks and active abilities.
Assassin Mechanics: Crit, Shards, Poison, Rush, Stealth.
Assassin Heroes
HoyoungThe NewcomerAssassin
YuunaThe ProfessionalAssassin
ZuriThe GorgonTankAssassin
DragomirThe ExecutiveAssassinA 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.
A/S rank options 15

On Crit, inflict 1 (+10% Crit) Poison on the target.

Gain +80% Crit against enemies with Poison.

Rush abilities last 3 seconds longer. Backup.

At start of combat, inflict 30 (+50% Crit) Poison on all enemies.

At start of combat, if this Hero is in the front row they gain (+250% Crit) Defense.

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

On Rush trigger, Assassins gain 15 Crit, 15 Attack, and 15 Magic. Backup.

On Crit, permanently gain 1 Attack and 1 Magic.

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

Every other Crit, gain 1 Shard.

On kill, gain 8 Shards.

For Rush (10), Assassins gain 1 Crit per Shard in bank. Backup.

At start of combat, gain Stealth for 5 seconds.
On kill, gain Stealth for 5 seconds.

At start of combat, if this Hero is in the back row they gain +100% Crit and Stealth for 5 seconds.

Gain 60 Crit and 20 Omnivamp.