Three Space Marines clustered around an objective my Eldar Howling Banshee was helping to capture in Warhammer 40K: Eternal Crusade, their big guns aimed at my teammates in the other direction.

Like a banshee siren sending shivers through the spine of the city," said a Twitter user posting under the name Ryan McNutt. "If you haven't heard the #HalifaxHowl yet, you'll be amazed. Such a ...