Unbeknownst to her , his blood is poisonous .
While Nessos lays dying , he offers Deianira some of his blood to use as a love potion for Heracles .
Unbeknownst to Deianira , Nessos blood blood is poisonous .
While Nessos lays dying , he offers Deianira some of his blood to use as a love potion for Heracles .