Attract ghoul

Attract ghoul was a spell that allowed a necromancer to summon a ghoul as their familiar.

Effects
When cast, this spell had a chance of enticing a particularly intelligent and exceptionally strong ghoul to the service of the spellcaster. It wasn't always successful, but was more effective the more powerful the wizard. Occasionally, the spell summoned forth a ghast which typically attacked less-capable necromancers.

If the casting was a success, attract ghoul created an empathetic link between the ghoul and the wizard, which lasted for the range of one mile. The undead creature obeyed simple commands as issued by the wizard, so long as they provided it with a suitable lair and ample food. The ghoul would wander away if they weren't well cared for.

Casting
The casting of this spell was a draining process, and could only be cast once per year. It required verbal, somatic components, as well as the material components of a rather expensive censer of myrrh and herbs.