Features which do damage:

• in tall grass~~~~
• wither effect in water
• fire is more deadly
• lava is more deadly

Anyoing Features:

• No Cobblestone in Inventory when on Clean Stone.
• When on deepslate no nightvision (you have night vision by default)
• Snowness effect when on moss block

Features with Mobs:

• Skeleton have knockback lvl 255 swords
• Skeleton are invisible
• Spiders are FAST
• Only Baby Zombies
• Strays have flame Bows

Block Replacement Features: (5 Block Radius)

• Stone replaces coal ore
• all logs are replace by their plank form
• Powder Snow replaces Snow Blocks
• Air replaces Snow (layer)
• Water replaces Ice

Other Features:

• Some Food will be gone, when dropped
• It is always night
• It doesn't rain
• No Saplings in the inventory