Rockworkers is a common dwarf unit that creates a structure on a random bordering tile. The strength of Rockworkers and its structure can be upgraded when leveled up. Rockworkers can see play in control decks.
Rockworkers' structure placement is random, so you have to adapt to its position or control it by playing Rockworkers with many bordering units.
Rockworkers' structure is an equivalently leveled Fort of Ebonrock. A level 2 Rockworkers will produce a level 2 Fort of Ebonrock, for example.
The structure spawned, like all structures, can be used to defend against an enemy or keep your front forward. Hearthguards can also benefit from it.