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Message: <blockquote data-quote="gnomebarbarian" data-source="post: 2088014" data-attributes="member: 29687">line of effect spells like a ray: You dont have to be able to see it to cast the spell (hitting it might be hard to do though) but there can't be something in the way or it will/can get blocked. (I.E. another player/critter gives partial cover to those behind them)light of sight spells: you have to see it to cast the spell at it. (if they are invisible or in darkness etc, or have total concelment other then with a tower shield etc.) however some effect spells such as summon monster is special you have to see the location that the monster is to be conjured into to summon it there. however you can also define the location by means other then sight (example: I have it appear 10 feet in the darkness straight ahead of me.) possibilites to define location might include listen checks, scent etc. to try to get the spell effect placed where you want it. effect spells with spreads: dont have to do anything but be able to to hit the area where the effect will spread from. (in other words you need line of effect to the burst orgin.) once it spreads though it can hit/effect things you cant see or have cover or concelmant for being around the corner or such as long as they are in rang of the burst. see page 175 in the PH under aiming a spell Effect definitons.</blockquote>