Wydhollow is the next release in the Warhammer Underworlds series, it contains many new features; including:

Two new types of actions:

Stun – One of your fighters chooses an enemy fighter adjacent to them and gives them a Stagger token, which lets you re-roll one dice in an attack or casting roll.
Barge – This is a superaction – like the Charge action – that combines the Move and Stun actions. It’s a risky move that staggers an enemy fighter while also staggering your own fighter as well.

New type of hex – the Snare Hex:

This is another danger to avoid, or to utilize in your combos. While not as immediately damaging as lethal hexes, they can set up some amazing combo opportunities.

New Ability – Salvage:

If you have a restricted power card in your hand, and each of the fighters that power card is restricted to is out of action, on your turn in the power step you can discard that power card and draw one power card.
If your warband contains one or more friendly wizards, and each of those friendly wizards are out of action, then on your turn in the power step you can discard a gambit spell and draw one power card.