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<blockquote data-quote="jgsugden" data-source="post: 8210167" data-attributes="member: 2629">There are two concepts to consider: Line of sight and line of effect.&nbsp; These are terms from prior editions, but they relate to the rules in the books even if they do not use the terms in the same way in 5E.A Clear Window does not block line of sight, but it blocks line of effect.Heavy obscuring fog and darkness can block line of sight, but not line of effect.If someone is invisible, line of sight to them is blocked, but not line of effect.Line of sight matters when someone is told they need to see someone. Literally, if they can see them they have line of sight.&nbsp; Line of effect is a requirement for spellcasting, generally.&nbsp; If you want to target something, you have to have line of effect unless the spell tells you otherwise.&nbsp; Sometimes this direction is less than clear, like in the case of scrying.The frightened condition gives penalties to attack rolls and ability checks when the source of the fear is present - but if the source is invisible, then generally you can't see them so the penalties are dropped - except that invisibility is also going to result in disadvantage to the attack anyways.&nbsp; However, if the source of the fear is invisible, there will not be penalties to perception checks to hear them, stealth checks to hide from them, etc...</blockquote>

[QUOTE="jgsugden, post: 8210167, member: 2629"] There are two concepts to consider: Line of sight and line of effect. These are terms from prior editions, but they relate to the rules in the books even if they do not use the terms in the same way in 5E. A Clear Window does not block line of sight, but it blocks line of effect. Heavy obscuring fog and darkness can block line of sight, but not line of effect. If someone is invisible, line of sight to them is blocked, but not line of effect. Line of sight matters when someone is told they need to see someone. Literally, if they can see them they have line of sight. Line of effect is a requirement for spellcasting, generally. If you want to target something, you have to have line of effect unless the spell tells you otherwise. Sometimes this direction is less than clear, like in the case of scrying. The frightened condition gives penalties to attack rolls and ability checks when the source of the fear is present - but if the source is invisible, then generally you can't see them so the penalties are dropped - except that invisibility is also going to result in disadvantage to the attack anyways. However, if the source of the fear is invisible, there will not be penalties to perception checks to hear them, stealth checks to hide from them, etc... [/QUOTE]

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