Warm and Cold Ocean Biomes and Their Underwater Structures
Ocean biomes in this mod come in warm and cold variants, and each one carries its own set of creatures and structures. Knowing what lives where helps you prepare before you dive.
Deep Warm Ocean
The Deep Warm Ocean has a temperate climate with a temperature of 0.5. It is not a safe place to swim blindly. Monsters that can spawn here include drowned, spider, zombie, zombie villager, skeleton, and creeper. The drowned are the main threat in the water itself, while the land-based monsters are a concern wherever solid ground meets the biome.
Water creatures are friendlier. Squid and dolphin both spawn in the Deep Warm Ocean. Dolphins are useful company while traveling, and squid are a reliable source of ink if you need it.
Seagrass Meadow
The Seagrass Meadow shares the same temperate climate as the deep warm ocean, with a temperature of 0.5. Its monster list is slightly different: spider, zombie, zombie villager, skeleton, creeper, and slime. Note that drowned are absent here, but slime take their place among the hostile spawns.
Creature spawns set the Seagrass Meadow apart. Turtle appear as regular creatures, and squid and dolphin fill the water creature slots. If you want turtles, this is one of the biomes to search.
Rocky Shore
The Rocky Shore is warmer on land, with a temperature of 0.8. Its monster spawns are spider, zombie, zombie villager, skeleton, creeper, and slime — the same list as the Seagrass Meadow. Turtle also spawn here as creatures. No water creatures are listed for this biome, so do not expect squid or dolphin to appear.
Volcanic Island
The Volcanic Island is also temperate at 0.8, matching the Rocky Shore in temperature. Its spawn list is short and unusual: drowned and barbed. The barbed mob is unique to this biome among the ones covered here, so the Volcanic Island is the place to look for it. There are no listed creature or water creature spawns.
Octopolis
The Octopolis is an underwater structure. It generates in the biome tag `#spawn:has_structure/octopolis`. Placement follows a fixed pattern: the game makes one attempt per 24x24 chunk region, and structures must be at least 8 chunks apart. That spacing means you will not find them clustered tightly together, so plan to cover distance if you are hunting for one.
Ant Mount
The Ant Mount is another structure tied to a biome tag, generating in `#spawn:has_structure/ant_mount`. Its placement is denser than the Octopolis: one attempt per 16x16 chunk region, still with a minimum of 8 chunks between structures. The smaller region size means attempts happen more often across the same area, though the 8-chunk separation rule still applies.
Practical Notes
- Warm and cold ocean biomes differ mainly in their spawn lists, so check which variant you are in before deciding what to bring.
- Drowned appear in the Deep Warm Ocean and the Volcanic Island, but not in the Seagrass Meadow or Rocky Shore.
- Turtle are found in the Seagrass Meadow and the Rocky Shore.
- Squid and dolphin are limited to the Deep Warm Ocean and the Seagrass Meadow.
- Both structures use biome tags for generation, and both enforce a minimum gap of 8 chunks between instances.
Covers the mod’s in-game guide topics: Deep Warm Ocean Seagrass Meadow Rocky Shore Volcanic Island Octopolis Ant Mount
Spawn