Curtain Of Shadows

You create a wall of frigid shadow that blocks vision and wracks all who pass through it with cold.

You create a wall of shadow that completely blocks line of sight. Any creature passing through the walls takes 1d6 points of cold damage per caster level (maximum 15d6).

Feign Life

You infuse one or more objects with shadowstuff, causing them to animate at your command.

This mystery functions like the spell animate objects, but the items grow dark and warped, becoming more sharp-edged and appearing slightly worn or decayed for the duration of the effect. In addition, objects animated by this mystery benefit from concealment.

Languor

You channel shadowstuff into the subject's shadow, literally weighing him down under its weight.

Languor functions like either the spell slow or the spell hold monster. You choose which version you want before the effect begins. If you choose hold monster, the mystery can affect only one subject.

Echo Spell

Even as you recoil from your enemy's spell, you reach into the Plane of Shadow and draw forth the spiritual reflection of that spell. With a grin you manifest it in the physical world and hurl it back at him.

Muhael's Impassable Pentacles

A spherical nexus of faintly glowing translucent blue pentacles linked by lines of binding runes spring into existence around your target. A target that fails its save is confined within the sphere, and cannot move or use melee attacks past the sphere. This effect extends across the corresponding space on the ethereal plane. 

Muhael's Spell Siphon

Muhael's Spell Siphon is a dedicated counterspell. It can only be cast from a readied action to interrupt spellcasting. Rather than directly undoing the magic as it takes form, it draws the spell energy away from the spell, and toward yourself, allowing you to absorb and repurpose it, re-energizing a spent spell slot up to 4th level, or the level of the countered spell, whichever is lower.

If Muhael's Spell Siphon is heightened, it can restore higher level slots, up to the heightened level -1.