Jirniy's Biome Additions

Added sea urchin block

• Acts like a underwater mine: breaks on contact, applying blindness, slowness, and poison debuffs
• Can be sheared to remove the destructive behavior
• Can be obtained via shears or silk touch, bonemealing will also drop a copy of it
• Generates occasionally in warmer oceans (ocean, lukewarm ocean, warm ocean and their deep counterparts)
• Generates frequently on shipwrecks and coral reefs