Targeting restrictions vary from spell to spell. However, unless stated otherwise the following rules apply:
The target must lie within the Wizard's forward arc.
The Wizard does not need line of sight to his target.
The target must lie within the spell's range.
Wizards cannot target spells at units engaged in close combat.
Some spells have a type that enforces additional casting restrictions, or waives others. There are five distinct types of spell: augment, direct damage, hex, magic missile and magical vortex. Some unique spells, or spells that are printed in older Warhammer army books, do not have a type – their text will contain any casting restrictions that apply.