I'd have to say that my RNG luck is pretty good (albeit annoying);
Farmed crimson for key, that took about 3 days of 3 - 4 hour sessions. About 2 days after I get the key and the vampire knives molds are introduced, so going out to check all the new stuff I pass the crimson and on my first kill the mold drops.
A similar scenario would be when I crafted my beautiful Terra blade after days of trying to get hero swords and solar eclipse events. After crafting i ended up getting 3 more hero blades despite struggling to get even one most of the time.
So me being me i decided to craft more Terra blades and make more keys and just give them to my friends who were having a hard time getting them.
A lucky day one.
first i spawn on one of thoose lifted up pieces of land, wich is great for building (to me at least).
under the lifted bit is 3 wooden chests. one spear, a boomerang and another boomerang.
i then find a close to surface cabin with aglet and claws.
the hole where the cabin was became my mine, where i quickly find a magic mirror.
lots of ore, giving me a good helm, greaves and weapons.
uuuum...I bought the game, created my char, my world, I enter to the world and the starting sword was legendary...yeah a legendary copper sword...slimes didn't have a chance, it took a while for me to realize what "legendary" means...I think I still have it, because when I look at it is like: awww!
PS: almos forgot, first wall of flesh, legendary pwnhammer, demon altars didn't have a chance...I had my revenge after almost being killed by one
On my current play through, my first day in hardmode spawned in a Pirate Invasion, after countless deaths and being spawncamped inside of my own house, I found a lucky Cutlass from a captain, and then I proceeded to slaughter the rest of the invasion and I got a Discount Card and a Lucky Coin before it ended.
I have like 2 frozen key molds just by playing through the game, no farm or anything. On that particular playthough i havent even beat a mech yet just got 2 molds by wandering around in the underground ice biome
ok, so im in 1.1,(version changers FTW) and i have shadow armor, so i go to the jungle. die.(mediumcore) i get my iron gear, and boom. blood moon. i survive that. RIGHT after the blood moon:
a goblin army is approaching from the west!
so i run off to the jungle,(to my right, or east) and get to my stuff. there's an army of mobs. i hide in a little tunnel, shooting at them. when it seems clear, i go for my stuff.
a ton of mobs were just offscreen. i grabbed my stuff and tried to jump down a hole to safety, but the stupid plant had to deal constant upward knockback to me, so no falling. i died. and my spawn was not in my house, about one screen to the left. so i got killed constantly by goblins as i spawned. raged. deleted the world. haven't played terraria since.(waiting for 1.3 to start again, i need a break.)