"A physical creature, judging by my experience last month. It can be hurt but it's quite sturdy. These rocks, though - they're able to hold back the corruption that seems to infect it and its minor minions. That's why there's such a demand for them at the moment.

"While it's possible that the source of the corruption is the sea it comes from, I don't think any of us have the ability to cleanse an entire ocean. If you have any ideas though, I'd welcome them."