Vent
Vent is a common Hellhorned spell in Monster Train 2 costing X Ember (it consumes all remaining Ember).
Deal 5X damage to enemy units.
“The Boneshaker is of my own design. Fueled by the last shards of the Pyre, the train is robust and dependable. One of its lesser-known features is the ability to unleash pressurized steam on invaders.”