Let me clear this up about those fragment drops and correct some key stuff that might trip you up in later game. The base game actually doesn't have star fragments at all, but there are a few specific items you should focus on getting instead. For prismatic shards, you'll want to dive deep into skull cavern, especially past floor 100 where iridium nodes have that sweet 4% drop chance and mystic stones give you a solid 25%. Bring plenty of bombs and keep an eye on your daily luck.

If you're after bone fragments instead, the ginger island dig site is your best bet, or you can hunt skeletons between floors 71-79 in the regular mines. They're actually pretty crucial for crafting deluxe speed-gro later on. The statue of true perfection is amazing for consistent prismatic shards once you hit that 100% completion, and don't forget about those meteorites - they've got a decent 25% chance to drop a prismatic shard when you break them open.

Just remember that if you're seeing guides talking about star fragments, they're probably referring to modded content. The base game uses different items entirely, and mixing these up can lead to some frustrating treasure hunts that won't pan out.