Which goddess was the scorpion goddess who protected the dead? Selket was that goddess.
Selket—also spelled Serket or Serqet—was an ancient Egyptian goddess associated with scorpions, venom, healing, and protection. Because scorpion stings and snakebites could be fatal, she was invoked to counter poisonous creatures and was also understood as a powerful guardian of the dead.
Her funerary role was especially important. Selket protected the embalming tent and was one of the goddesses associated with the canopic chest that held a deceased person's organs. She also protected Qebehsenuef, one of the Four Sons of Horus, who guarded the intestines. Neith, Isis, and Nephthys shared related protective duties.
Selket is commonly shown as a woman wearing a scorpion on her head, sometimes holding an ankh and a was-sceptre. She is not the only Egyptian scorpion goddess—Hedetet is another—but Selket is the standard answer for the famous scorpion-protector deity. Her name is often interpreted as “she who causes the throat to breathe,” connecting her with breath and healing.