A verb seems to be missing from the first sentence ("...work their magic..." or something?), also "prefering" should be "preferring":

BLACK DUELIST (1684)

Necromancers are not well-known for bold combat strategy, usually prefering to skulk behind minions of various kinds and their magic from behind. A rare necromancer, however, is known to savor the rush of exquisite violence that toe-to-toe combat affords. A necromancer who learns to benefit from such chilling bloodthirst is able to cast all his spells to greater effect while in the midst of head-on conflict.

See also: EDGES