Heavily armed Son'a warships, two of which hunted the Enterprise-E through the Briar Patch in 2375 and used a banned isolytic subspace weapon against it in Star Trek: Insurrection.
Son'a battleships appear in Star Trek: Insurrection. When the Enterprise-E leaves the Ba'ku planet to tell the Federation Council about the plan to remove the Ba'ku, Ahdar Ru'afo sends two battleships after it, with Admiral Dougherty's reluctant consent.
Inside the Briar Patch the ships fire an isolytic burst, a subspace weapon outlawed by the Second Khitomer Accord, which tears a rift that chases the Enterprise's warp core. Geordi La Forge ejects the core to seal the tear. Riker then has the ramscoops gather the volatile metreon gas of the nebula and vents it at his pursuers; when they fire, the gas ignites, destroying one battleship and crippling the other.