Kali rules this day, suitable for administering poison and calling of elementals and spirits.
Shukla Chaturdashi is the name for the 14th Tithi (lunar day). It's the 14th Tithi of Shuklapaksha. It's nature is Ugra Prada, which can be interpreted as "increase of aggression and aggressiveness". It's good for following works: bad works, attack by deception, hunting, poisoning, war, weapon, making of (fire) arms, fire, arresting; success in cruel works, steel. Also it's bad for travelling & hair cutting.