Drusilla is giving me big Green Hag vibes --lives next to the water, her floating home is decorated exactly like Auntie Ethel's teahouse, and the anchor through the heart sounds like an Auntie Ethel wish gone wrong for the wisher.
Wild theorizing here:

The elf bard visited Drusilla, and said that he was ready to settle down from his vagabonding, to feel anchored.
Drusilla granted his wish.