Conjuring Blood and Venom Elementals

Conjuring a venom elemental or a blood elemental is similar to
summoning a water elemental—with a few particular changes.
For both types, the spell has the same casting time, range, and
duration. For a venom elemental, the water and sand used as material components are replaced by water and venom taken
from a giant spider or snake within the last 3 days. For a blood
elemental, the material component is salt water with at least 1
gallon of fresh, uncongealed blood added to it.