Void Cracks
Void cracks, often informally referred to as 'holes', are breaches between the material world and the Shattered World. Often found in the dark corners of the city and near sites of tragedy, these dangerous paranormal phenomena allow shadows and husks to spill through into the material world. Inversely, these breaches can also be used as entryways into the Shattered World, however all but the most prepared and well-trained are likely to meet a swift demise on the other side.
Of particular note is the fact that once a void crack has been used to cross over to the other side, it cannot be used to return for quite some time, necessitating that the character who crossed find an alternative exit than the way they came in and further adding to the danger of crossing.
The sealing of void cracks is done via the usage of talismans.