Pheromones

When the Defenders faced the villain Mandrill, he led an army of women called the Fem-Force (Defenders #90-91). Mandrill's first female ally, however, was Nekra. Born with chalk-white skin and fangs, Nekra's vampire-like appearance made her an outcast since childhood. As a mutant power, Nekra gained invulnerability and superhuman strength when she felt hate—similar to the way the Hulk became more powerful when angry.

Soon after splitting from Mandrill, Nekra found an enemy in Spider-Woman. In contrast to Mandrill, whose mutant pheromones could allure women, Spider-Woman produced alarm pheromones that made others ill at ease. She received this medical diagnosis—a secret side effect of her spider powers—in her civilian identity as Jessica Drew. Ironically, Spider-Woman's pheromones had an inverse effect on Nekra, inducing in Nekra a sense of trust, which reminded her of Mandrill, which thereby intensified her hatred (Spider-Woman #16).

Nekra's original entry from The Official Handbook of the Marvel Universe noted that she could lift (press) about 10 tons at peak strength.