I have some suggestions:
"One time, in a corruption chasm, I saw a baby eater of souls chewing at a bone. However, a giant Devourer came and ate the eater of souls and the bone. I wonder if it is still alive."
"I've heard theories of Spiders having staffs in their mouths. That's exactly what I saw when I went deep into the caverns of [World Name]."
"There are traveling Merchants who wander the world to sell goods. Who know's what their selling, it might even be a rare weapon!"
"Noble Warriors can be found deep in the dungeon. I have no clue as to who's inside though. Their gear is also quite effective with others."
"Sometimes, even the largest of Bees can contain rides home."
"I know of a way to get the powers of the dungeon mages, but it's a secret to everybody."
"Occasionally, I see blue sticks coming out of thunder clouds."
"If you need it, Skeletron has some loot hiding in his bones. I think you have better weapons than those though."
"Some chests aren't actually chests. They still have gear inside them though."
"Fishing may bring you junk, fish, or other useful stuff."
"If you have enough patience, you can get even the strongest Chaos Elemental energy."
"Most monsters have banners that they can drop. Bosses don't, but they have hang-able trophies and wearable masks.