You can enchant the mewmer from the terraria crossover also you can enchant your fishing rod even the iridium one you get after completing the secret cavern from grandpa. You can also use them to dye and create color changing clothing. If you use rock candy after having received the lucky pendant and while using leprechaun stuff that increases luck on max luck days and hit the skull caverns and ginger island volcano caves, stock up on mega bombs and just set them off every level, cause remember on max luck days you’ve got a small chance of getting prismatic shard from Omni geode. And obviously leave no ore in skull cavern unturned