If you dream of necromancer, then such dream indicates the danger you will receive from your enemies. For e better explanation of the dream, please see the meaning of Hypnotist.

…Dreaming of a large, handsomely dressed crowd of people at some entertainment, denotes pleasant association with friends | but anything occurring to mar the pleasure of the guests, denotes distress and loss of friendship, and unhappiness will be found where profit and congenial intercourse was expected. It also denotes dissatisfaction in government and family dissensions. To see a crowd in a church, denotes that a death will be likely to affect you, or some slight unpleasantness may develop. To see a crowd in the street, indicates unusual briskness in trade and a general air of prosperity will surround you. To try to be heard in a crowd, foretells that you will push your interests ahead of all others. To see a crowd is usually good, if too many are not wearing black or dull costumes. Dreaming of seeing a hypnotist trying to hypnotize others, and then turn his attention…

…Dreaming of a necromancer and his arts, denotes that you are threatened with strange acquaintances who will influence you for evil. See Hypnotist….