Dark witchcraft spells is really just another way of saying black magick, so don't fool yourself into thinking it's something "less bad". Neither one is bad, just various shades of witchcraft that you can use when the right situation arises. Earlier pages on dark spells are available for more magickal options if these aren't what you need.
Ace of Spades
The ace of spades has long been associated with death and dark forces, and you can use that in your next spell. This particular bit of dark witchcraft will create illness for another person, though nothing life-threatening. You'll need:
Before you cast the spell, bury the cloth in the ground for 3 days. Dig it up and you're ready to cast the rest of the spell.
Lay out the playing card, then a piece of paper with the other person's name on it, then cover with the cloth. Drive a nail through the center of all 3 items (have something sturdy underneath, like a piece of wood). Say out loud the words of the spell:
By the power of my will,
Make this person get very ill.
Magick power, ace of spades,
Many days until it fades
Bury the whole charm where you had the cloth at the start. Leave it for 3 more days, then dig it up again. Burn it, and the spell is complete.
I don't normally mix dark witchcraft and money spells, but I thought this might suit some situations. This spell brings bad financial luck to your target, which can appear as a problem at work as well. It's about the money with this ritual.
Fill a jar with vinegar and at least 3 whole peppercorns. Drop in one coin at a time, saying "dark money, lost money" with each one. Seal up the jar and focus your energy on your target person.
Hold the jar in your hands and say the words one more time. Leave it somewhere quiet and dark (basement is best) and financial woes will soon begin.