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School illusion (glamer); Level sorcerer/wizard 8; Domain trickery 7

CASTING

Casting Time 10 minutes
Components V, S

EFFECT

Range close (25 ft. + 5 ft./2 levels)
Area 30-ft. cube/level (S)
Duration 24 hours
Saving Throw none or Will disbelief (if interacted with); see text; Spell Resistance no

By the way…
This spell can be cast on a ship.

Source Skull & Shackles Player’s Guide

DESCRIPTION

This spell creates a powerful protection from scrying and observation. When casting the spell, you dictate what will and will not be observed in the spell’s area. The illusion created must be stated in general terms. Once the conditions are set, they cannot be changed. Attempts to scry the area automatically detect the image stated by you with no save allowed. Sight and sound are appropriate to the illusion created. Direct observation may allow a save (as per a normal illusion), if there is cause to disbelieve what is seen. Even entering the area does not cancel the illusion or necessarily allow a save, assuming that hidden beings take care to stay out of the way of those affected by the illusion.