Create Crystal Scene Foci

The caster throws a small cut gemstone (min 10gp value) into the air whilst verbalising the spell.  A flash of light is emitted by the spell, and the crystal lands back, emblassened with a Runic mark relating to the caster.  The stone can then be used as a focus for illusion spells to view an image of everything in a 30 ft sphere of where the spell was cast, this is effected by solid object such as walls.  However reflections from surfaces (like mirrors), the view from telescopes or other similar devices can be seen through in the illusion.

When the Crystal is used as a focus for illusion spells the illusion spell is adjusted slightly.  minor illusion is just like a small image of the event, (subject to normal limits), phantasmal force however allows the target (which in this use can be the caster) to mentally walk around the scene for the duration, damage only happening if the user puts themselves into a damage source (which could include a fireball going off). higher level illusions than this can add additonal perameters such as scent.