Ghost Pirates of the Sea-erra Madre

You fire your harpoon gun at the humanoids with legs, impaling one in a manner too gruesome to fully describe in this book. They retreat and the merfolk begin to celebrate.

Some mermaids swim towards you and up close you realize how terrifying they are. Their strange bulbous eyes and razor sharp teeth make them look decidedly non-human. Did you make the right decision by supporting them?

"Greetings surface dweller," one says to you telepathically in perfect English.

The horrifying merfolk invite you to return to their home with them. You're not sure and try to explain that you're going to run out of air soon. However, they quickly offer you an amazing technological device that allows you to breath underwater.

You could decide that you've run out of excuses and go with the merfolk, or you could just leave anyway.