GM Arkwright |
I'd suggest they can only stealth if 1. they're in darkness and the scryer doesn't have darkvision, or anything similar or 2. the stealther has some version of the Hide in Plain Sight ability. If not, sounds like a straight perception/stealth check, with no modifier for distance as scrying is presumably quite close.
Kimera757 |
I figure you could stealth against clairvoyance, provided you can find cover or concealment, but could only use total concealment against Scrying. (The scryer would know which square you're in, unless you also had Nondetection.)
In both cases, the stealther would need to know they're being observed first. Kind of hard to hide if you don't know where the eye is.