When the Red Tooth Shark bit Morticia, she felt a strong venom poured into her body. The venom spread throughout her body, counteracting the Blood Spirit Pill's poison.
The Red Tooth Shark's venom would cause severe numbness. Once infected, no matter how strong the cultivator, they would be incapacitated. Coincidentally, the venom and the Blood Spirit Pill were mutually exclusive.
Perhaps it was the gods' will. Morticia would not be able to live if other sea creatures attacked her.
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