Nightbringer
$1Vladimir  $2Sejuani  $3LeeSin  $3Morgana  $3Yasuo  $4Aphelios  $4Diana  $5Darius
Nightbringers gain a shield for 8 seconds equal to a percent of their maximum Health the first time they drop below 50%. When this occurs, that Nightbringer gains bonus damage.2 30% shield, 20% damage
4 60% shield, 30% damage
6 90% shield, 40% damage
8 140% shield, 50% damage

Dragonslayer
$2Trundle  $3Pantheon  $4Diana  $4Mordekaiser
Dragonslayers gain bonus Ability Power. After the first Dragonslayer ally scores a takedown on an enemy with at least 1400 maximum Health, all allies gain additional Ability Power for the rest of the round.
2 30% Ability Power for Dragonslayers, 20% for team
4 80% Ability Power for Dragonslayers, 60% for team

Assassin
$1Khazix  $2Leblanc  $3Katarina  $3Nocturne  $4Diana  $5Viego
Innate: When combat starts, Assassins leap to the enemy backline.

Assassin’s Abilities can critically strike and they gain bonus Critical Strike Chance and bonus Critical Strike Damage.2 +10% Crit Chance and +25% Crit Damage
4 +30% Crit Chance and +55% Crit Damage
6 +50% Crit Chance and +90% Crit Damage