Blackhound Oil.

Call upon the black hounds with red eyes for protection and guardianship. 
To use simply anoint a candle with hellhound oil at the start of working and light it, call in the black hounds and ask for protection then proceed with your working. When working is finished thank the hounds for their service and snuff out candle so they may leave.
May be used with any working and offers protection from entities from the liminal that wish to do harm. 
It is rare to see a black hound but many report hearing them pant and their paws on the floor around them.