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"A Zi rank Necromancer gains control over an additional true Zi rank spirit with each rank they rise, and their strength must increase by one rank as well. That means if you are a Second Rank Zi rank Grand Sorcerer, then you must have at least two Zi rank spirits of equivalent or higher rank at your command. Simultaneously, the range of soul control, or the coverage of the Necromantic Curse, will also reach two thousand square meters, growing exponentially."
"You might think that the area covered by the Necromantic Curse is considerably smaller compared to the Forbidden Curses of other magic attributes, but you must also understand that the casting speed of the Necromantic Curse is faster than any other magic, and the spirits pulled instantly can still be used again for other purposes."