Mobygames says Necromancer was published in the USA by Synapse on Dec 1983. The C-64 port was first advertised in the January 1984 magazine issues. Ahoy! April 1984 first mentions it in their game roundup, That's from Synapse, as is the 64 adaptation of Necromancer, teeming with magical trees, poisonous spiders, and other strange entities.