You will get 2 Slayer Keys

Contents of the Slayer Crate:

Slayer Abra- 12.5% chance

Slayer Vulpix- 12.5% chance

Slayer Mew- 12.5% chance

Slayer Mewtwo- 12.5% chance

Slayer Arcanine- 12.5% chance

Slayer Butterfree- 12.5% chance

Slayer Ariados- 12.5% chance

Slayer Marowak- 12.5% chance