The Suliban stealth cruiser was a cloak-capable warship of the Suliban Cabal, larger than the one-man cell ships, a group of which surrounded and boarded Enterprise in 2152.
Stealth cruisers appear in the two-part Enterprise story Shockwave. After Enterprise is blamed for an explosion that kills 3,600 colonists on Paraagan II, Archer discovers that the Suliban caused it, and Silik's ships close in on Enterprise demanding the captain.
The cruisers drop their cloaks around Enterprise, and when Archer is snatched into the future by the temporal agent Daniels the Suliban board the ship, confine the crew to quarters and take it to the Helix. The cruisers keep it under guard until Trip, Reed and T'Pol trick their captors into thinking the warp reactor is about to breach and escape.
The vessels use the same cloaking technology as the smaller cell ships, given to the Cabal by its sponsor from the future.