Ilic was the capital city of New Cov. It was built under a dome to protect the inhabitants from carnivorous plants.
During the Galactic Civil War, New Cov's capital, Illic, was the place of meeting between members of Garm Bel Iblis's movement and Bothan sympathizers of the Rebel Alliance. Rebel leader Garm Bel Iblis ran a phantom company named Amethyst Shipping & Storage in Ilic to supply his secret base Peregrine's Nest.
During the Thrawn campaign, another Imperial raid in Illic revealed clearly the connexions between Bothans and Bel Iblis. In fact, two New Republic officers were present this time: Han Solo and Lando Calrissian. Bel Iblis stopped to use Illic and New Cov after they convinced him to join the new Republic.