Which of the World of Warcraft expansions has Illidan on the cover?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q815739', 'id': 0, 'label': 'Warcraft'}, {'type': 'INTERNAL', 'name_': 'Q26181639', 'id': 1, 'label': 'Warcraft universe'}, {'type': 'INTERNAL', 'name_': 'Q819804', 'id': 2, 'label': 'Malfurion Stormrage'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q819544', 'id': 3, 'label': 'Illidan Stormrage'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q15139238', 'id': 4, 'label': 'World of Warcraft: Warlords of Draenor'}], 'links': [{'name_': 'P1080', 'source': 2, 'target': 1, 'label': 'from narrative universe'}, {'name_': 'P3373', 'source': 2, 'target': 3, 'label': 'sibling'}, {'name_': 'P179', 'source': 4, 'target': 0, 'label': 'part of the series'}, {'name_': 'P1434', 'source': 4, 'target': 1, 'label': 'takes place in fictional universe'}]}