By drop rate, technically the slime staff is the rarest item in the game (followed by the coin gun and lizard egg). But as far as rarity to actually obtain, I would probably say the obsidian horseshoe because nobody in their right mind would make it lol.
Dr. Bones banner is much more rare. He only shows up at night in the jungle at about the same rate as the Nymph. Also, might your friends Nymph farm have been in hardmode? Every playthrough I do I set up a farm in a prehardmode world and get my Nymph banner and Mining Armor in about 2 hours. I also think Reindeer Bells are extremely tough to get but if you set up a mana system. Like magic or celestial cuffs and dungeon spikes then you can breeze through the event all the way to wave 20, solo with the last prism. (Now you just demolish it with the Zenith). Lol.
Same TBH I feel it would have made far more sense if the golden chests in Pyramids were made to carry sandstone chest loot with an additional unique chance for the Pharaoh's robes vanity item.
All 3 of the items are likely equally rare but since Pyramids are very rare (there seems to typically be between one to zero on average from my experience) this means that it is unlikely you will find any given Pyramid item. Thus far the two pyramids I found both had sandstorm in a bottles which isn't something I will be complaining about as it is the only one that is crafted into something else
If you count specific seeds then yes objectively everything ceases to be hard to get hence why the implicit assumption was that no special seeds and random world unless it isn't possible (as is the case for Moon lord's Legs and Red's Potion). And the Terragrim does not generate on world gen swords in the stone have a 10% chance to yield a Terragrim instead of an Enchanted Sword. Given a world may only have a few such swords if any the odds are not in your favor to obtain one in any given world so it certainly isn't as straight forward as you claim. Also remember that special seeds work differently in that they change how world gen works but still are otherwise random.
You still use an enchanted sword shrine seed to get the Terragrim. World's generate so fast in 1.4 that you take an enchanted sword shrine seed and create it over and over til your shrine produces a Terragrim. It doesn't take long, esp if you use one of the small world enchanted sword shrine seeds. I don't remember anybody saying "what's the rarest items without using seeds" and discussing it that way would just be silly considering that's one of the main things ppl use seeds for in the first place. The bottom line is that world gen items are no longer rare nor do they take long to get. You can get a Terragrim in 20 minutes. Lol. Regardless, I would still put the Terraprisma above any item even without seeds and ppl never talk about the Dr. Bones banner. That thing is a
to aquire. Lol.
Terragrim is no longer rare bc of enchanted sword shrine seeds. You can get one in 20, 30 minutes. Just Google enchanted sword shrine seed, use the seed, break the shrine then repeat until the shrine produces a Terragrim. I think Terraprisma is hardest and Dr. Bones banner is the rarest. That thing takes forever to farm. Lol.
That’s like saying Zenith is easy to get because you can just load a world you already have one in.
Stand on spikes from the dungeon with a pair of magic or celestial cuffs equipped and use a razorblade typhoon to mow them events. You would have to beat Duke Fishron first to obtain the typhoon and he's not the easiest thing on the 3ds version but I still think it's the best way.
