The attacks from the realm of doom were too representative. They used all kinds of spiritual artifacts. Anything related to fortune-telling, prediction, curses, and disaster-breaking could become their spiritual artifacts. For example, copper coins, turtle shells, bamboo sticks, bamboo tubes, and even bells and bamboo boards could become their spiritual artifacts.
Curses were a type of magic, and magic was not very important among the things that cultivators learned. Only those rogue cultivators would seriously practice it, and the gitorians rarely practiced magic.
However, in the finger catastrophe realm, curses were used to the extreme. Any kind of spell, once developed to the extreme, would have unparalleled power, just like this curse power.