Dark Eldar - Harlequins army (about 1500pts)

Hi guys! I'm planning to buy the Death Masque set with a friend and I would take the Harlequin part, but I don't want to make an Harlequins solo army, I want to integrate it in a Dark Eldar army. How can I do that? Can you help me to make a 1500pts list for a Dark Eldar - Harlequins army?