What Does Slay Do?
Slay gives the character a bonus when it kills another character during a fight. The bonus can be anything in the game depending on the card text.
The Slay ability fires immediately after the two characters fight, regardless of whether or not your character is also killed. This means that a Slay ability cannot alter the result of the fight between the characters. For example, if a Vain-Pire fights a character with exactly the same Attack and Health then both will be killed. The Vain-Pire will gain his +1/+1 Slay bonus for the next brawl, but it won’t stop him dying.
Also note that Slay abilities only fire when the character with Slay initiates the fight. If A Slay character is attacked and kills the opponent in defence then the Slay ability does not fire.
List Of Slay Characters
See Also: List of Character Abilities