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Message: <blockquote data-quote="bret" data-source="post: 383053" data-attributes="member: 713">I got curious enough that I reread the magic chapter and a few of the spells in question, looking for clues.I think the sensor must exist before any information can be sent back from it. At very least, using a Ready action to Dispel a Magical Sensor should be effective.I couldn't find anything that told me exactly when it does appear. Lets look at the rules with respect to the Clairaudience/Clairvoyance (PHB 184) and Scrying (PHB 247-8) spells.PHB 148 Casting timeThis means you have to select where the invisible sensor for a Clairaudience/Clairvoyance spell will appear before you start casting it. The sensor is the effect which must be placed.PHB 150 The spell's ResultThe results from Divination spells is information. You can't start sending any information back from the magical sensor until the spell has completed. This comes after any chances for counterspelling, saving throws, spell resistence, etc. I take this to mean that the Magical Sensor has to have been created before this point, otherwise there would be nothing to feed the results back with.If someone can see a person casting a Clairaudience/Clairvoyance spell, they could counterspell it. Seems the same would apply to Scry. There has some none zero time between when the spell is completely cast and the spell results occur. That is the time during which you would normally be doing saving throws, spell resistence checks, etc.Spells are cast in the same way. It does not matter if the spell in question allows a saving throw or spell resistence, the time would be there for these things to happen it is just that some spells are immune to those type of defenses.So it seems to me that there must be some non-zero time between the casting of Clairaudience and when you first see something through the sensor that the magical sensor was in place.So I ask again, when does the Magical Sensor appear for Scry or similiar spells?</blockquote>

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