Impenetrable Barrier

Invocation Grade: Dark

Equivalent Spell Level: 7th

You can conjure a wall of force as the spell with this invocation. The wall is black and blocks sight of all kinds. You can only have one impenetrable barrier in effect at a time, if you use the invocation a second time before the duration of the first expires, the previous wall disappears. If your barrier is destroyed (such as by a rod of cancellation, a sphere of annihilation, a disintegrate spell, or a mage’s disjunction spell), you take 1d10 points of damage.

Source: Dragon Magic, page 82.

Roll20 Macro