Ice and Fire UPDATE!!! Death Worm! Siren! Hippocampus!
Siren islands are rocky formations made up of a variety of different blocks. They spawn in ocean and coastal areas, and sirens spawn here. They are best avoided at all costs as sirens are very glitchy and earplugs don’t always work. They were added in the “Death worms, sirens and Hippocampi“ update (See below).