Unseen World v0.4.1 changelog:

Worldgen

• Multinoise biome source was replaced to custom one
• Surface biomes don't spawn below 32 y anymore
• Added new variations of caves for cave biomes
• Added slate clusters that may contain ore as well
• Fixed replacement of bedrock by other mod's blocks
• Changed feature generating biome tags

THIS VERSION MARKED AS FORGE SUPPORTING, BUT ONLY IF SINYTRA CONNECTOR IS PRESENT