I'll be the nice one and spell it out!
Essentially if you go down there on a Sampire, you can have 5-8 things attacking you at the same time and you just whirlwind through it, leeching back life, mana, and stamina, so that in the end, you're already ready for the next batch. There are many variations on the sampire, so you'll have to find which one works best for whichever ingredients you are farming. The best places are usually Crimson Veins or Cavern of the Discarded.