Joust is a Countess ability unlocked at level 20 It costs 60 mana to activate and every second to maintain it. The Countess charges forward in a straight line, dealing constant damage to foes and knocking them back (including ogres).
Joust will be interrupted upon running into an obstacle. It can be cancelled early by casting the ability again.
On high-end maps, Joust is a valuable ability for keeping ogres away and/or killing them instantly by pushing them off a ledge.