Open Plains: Friendly units which have a mount get +2 to their Move characteristic.
Flathorn Stampede: After deployment but before the first battle round begins, pick 1 enemy unit on the battlefield with a Wounds characteristic of 1 or 2. That unit suffers D3 mortal wounds.
Drive The Beasts On: (Ironjawz Only): When using the Flathorn Stampede ability, you can pick up to 3 enemy units on the battlefield with a Wounds characteristic of 1 or 2 instead of 1.
Run them Down: (Hedonites of Slaanesh Only): At the end of the charge phase, you can pick 1 enemy unit with a Wounds characteristic of 3 or less that is within 1″ of a friendly unit that has a mount. That unit suffers D3 mortal wounds.