Crying Obsidian used to craft/convert 'dark' beacons

Crying obsidian offers a natural 'evil' counterpart to regular obsidian, but currently enjoys little utility for the player. Using the crafting recipe for the beacon already, the player could either craft or apply cryign obsidian to their beacons to create a beacon with 'evil' effects.

Such effects could be:
-Increased evil mob spawning for players, farms, and danger
-Status effects such as weakness, slowness, etc. for minigames and adventure maps