New Mob: Reefcrabs

Introduction:
Reefcrabs would liven up coral reefs and ocean exploration, making these areas feel more alive.

Main Features:

• Reefcrabs spawn in coral reef biomes.

• Scuttle sideways, sometimes carrying shells or coral pieces on their backs.

• Drop crab shells, which can be used for decorative armor trims or crafting decorative blocks.

Gameplay Impact:
Reefcrabs make coral reefs feel bustling with life, while offering builders and players a new decorative resource.

Closing Hook:
Reefcrabs would bring oceans more charm and reward, adding character to coral reef biomes.