Does lead block divination? 1) It has no effect. As far as magical interference is concerned, it seems to only block divination magic.
Can you SCRY on a location? Scrying Location: You can choose to scry on a particular location instead of a creature. Doing so requires a Spellcraft check (DC 20), using the same modifiers for the DC that apply to the Will save (see scrying spell).
Can you stop scrying 5e? The character scrying on you can cancel the scrying as a reaction to your spell, but if they do not they suffer a -20 penalty on their Will save to resist the attempt. Previous attempt to scry the same subject failed.
Can Detect Magic detect scrying? Yes, the Scrying sensor can be sensed with Detect Magic
” The spell creates an invisible sensor within 10ft of the target. A creature that can see invisible objects sees the sensor as a luminous orb”