Wizard shots

[Boiling Point]

So, I played a casual game against a mate of mine today. And he used his wizard (Chaos Sorcerer Lord) to cast a spell on a model that isn't visible to it.
As the rules don't state that you have to have line of sight to cast magic, I let it happen. He also used the Chaos Sorcerer Lord's ability (re-rolling save rolls of 1) on the same unit.
Just wondering if that can really be done? If a spell, ability or attack requires you to pick a unit/model within a range (So not an area of effect abililty), should it have to be visible to the unit/model that's casting the spell/using the ability/making the attack?

[hobgoblinclub]

It specifies in the spell whether you require line of sight.  Arcane Bolt for example reads, 'Which is visible to the caster'.  If a spell doesn't say that, it doesn't require it.

Oracular Visions doesn't mention line of sight, therefore you don't need to see the target.

[Darth Alec]

@hobgoblinclub Is correct. For spells, you do not need line of sight unless specified. Do note that for shooting attacks, you must have line of sight. Unless the warscrolls specifically says you don't (such as with catapults).