text: One of these creatures plans to kill his foster-son, but his plan is unveiled when that foster-son cooks and eats a heart and becomes able to understand the speech of birds.
full_question: One of these creatures plans to kill his foster-son, but his plan is unveiled when that foster-son cooks and eats a heart and becomes able to understand the speech of birds. One of these creatures transforms into the dragon Fafnir and is slain by the sword Gram. A goddess spends four nights sleeping with four of these creatures in exchange for a golden necklace. These creatures descend from maggots festering in Ymir's corpse, and mostly take refuge in the dark world of Nidavellir or Svartalfheim, where they forge items such as Skidbladnir, Brisingamen, and Mjolnir in their role as master smiths for the Asgardians. For 10 points, name this race of diminutive human-like creatures from Norse mythology.
first_sentence: One of these creatures plans to kill his foster-son, but his plan is unveiled when that foster-son cooks and eats a heart and becomes able to understand the speech of birds.
raw_answer: dwarf [or dwarfs; or dvergr; or svartalfr]