Answer: kobolds

AnswerCrossword Clue
KOBOLDSGnomes, in German folklore.
koboldsspirit that haunts mines or other underground places
koboldsspirit or goblin, often mischievous, that haunts houses
koboldsKOBOLD, an elf (a small fairy (a creature of folklore, an imaginary being, generally of diminutive and graceful human form))