Enter the nether to obtain Crimson Hyphae. Surround an Amethyst Shard With One Redstone Dust, One Red Dye, and Four Crimson Hyphae to get the Bane of Blood. Create a portal with Crimson Hyphae and Light it with the Bane of Blood to open a portal to the Bloodlust Dimension. This looks like the overworld but is so dark you will not be able to traverse this hell without night vision or torches. Put a Blood Block and a Bottle in a crafting table to get a Bloodlust Vial. Craft with bloodlust vial with an Amethyst shard or a stick for a bloodlust Shard or Bloodlust Stick. Craft two Bloodlust Sticks and a Bloodlust Shard in a Shovel Pattern to create the Bloodlust Staff. The Bloodlust Staff lets you cast Blood Magic Spells one right click. These spells are:
Vampiric Aura Bleed Bloodborn Parasite Bloody Fist