Please answer the following question: Generate a question that has the following answer: Wolves for the following movie plot: The film begins with a voice-over monologue by vampire Selene, telling the story of the lycans and vampires. It has been 20 years since the war between them has begun (set several years before the first Underworld movie). Viktor (Bill Nighy) has built up an army of vampires to fight off the threat and have begun the process of exterminating the lycans. It appears that when someone is infected by a lycan, they transform into werewolves, but do not change back and appear to behave like vicious animals rather than people. However, one day, in a prison cell, Viktor hears the cries of a human child, and investigates. What he discovers is a human child born of a lycan later named Lucian. Viktor contemplates killing the child, but could not bring himself to do it.Lucian grows up, and appears to be stronger and more focused than others of his kind; this is evident when Viktor tests him by making him fight vampires. Viktor decides to make more of Lucians kind (the new lycans that have human form). Viktor uses Lucian to make more like him by starving him and letting him feed on human slaves. The ones that survived became the new lycans, a new slave race to serve the vampires. The vampires think they have control of the lycans, but this may not be the case for long.Note: there are two types of were-wolves in this film, ones that are permanently in wolf form and wild, and ones that can transform when its a full moon and are in service to the vampires. I will refer to the former as wolves, and the latter as lycans.Cut to the present, a horseman is riding through the woods at night, pursued by something. At the castle, Viktor is discussing politics and finances with his advisors, Coloman (David Ashton) and Orsova (Elizabeth Hawthorne). The wolves have been attacking the human slaves, which Viktor replies with some variation of I dont give a crap, however, human slaves are their principle source of food and income (the human nobility pay Viktor for protection against the wolves), so they have to take action and hunt down...
A:
What creatures does Lucian summon to storm the fortress?