Hammer has the ability to alternate between Tank Mode (where she is mobile and has a shorter range and less powerful damage) and her Siege mode (where she is immobile yet has a longer range and more damage compared to her mobile counterpart). Hammer is a Ranged Assassin who excels at dealing large amounts of sustained damage from a very long range. The second is the more radical 'siege mode' in which the vehicle becomes a static emplacement able to deploy a much more powerful and longer ranged weapon. First is the 'tank' or 'assault mode' in which the vehicle may be used in the familiar armored support role using relatively light weapons. Two primary variants of the siege tank exist the Arclite, in service during the Great War, and the Crucio, which remained the core siege tank of the Dominion in the Second Great War and beyond. Mobile siege tanks were in existence by 2480, several years before the official beginning of the Guild Wars.

An existing tank design was modified so that it could operate as a conventional tank in addition to being able to deploy the cannon and become a static artillery emplacement at will. However, the conflict demonstrated the need for mobility and as a result an effort was made to make the cannon more mobile. Prior to the war, work had progressed on a static 'final defense' cannon. The dual-mode siege tank concept was a Terran Confederacy response to the Guild Wars and the Goliath. Siege tanks are terran vehicles that can be configured to fulfill both the armored support and the long-range artillery support roles. Her ability to deliver her shells within inches of her allies has earned her a reputation among the Dominion Marine Corps, with some marines remarking 'never trust a women who paints her tank red.' Hammer,' is a famed Crucio-siege tank pilot of the Terran Dominion.

Starcraft 2 campaign siege tank