I found a few hicks when testing limitations of the game.
1st was that while in an instance dungeon. I managed to make a wooden hammer. Found out that in game play that you can destroy background such as walls, fences, windows, sails. etc and even reshape blocks by hitting em.
2nd is that statues can spawn monsters and even items. I found a heart, star and bomb statue and they all spawn items. I managed to farm hard mode monsters. Medusa and unicorns in instant dungeon by placing statues where traps were located, then step on the switch. They don't drop items but they give but loads of exp.
3rd is that the dryad sells purification powder. For
s and giggles i went and purified all the corruption and crimson i could reach and it did not grow back.
4th is that i spawned over 200 bombs and went on a spree to see what i could blow up. Found that it does not blow up blocks but it does destroy back ground items like walls and fences. ( i blew up the pyramid base, the forest and the churches stained glass walls. I now have fancy background and windows for my house
.)
5th is Quest item duplication. For example at the start of the game when i went to pick up the bow and arrows. I found out that if you don't have the item in question in your inventory, you can keep making it spawn until you place it in your inventory. I have 3000 fire arrows. The guy at the start i managed to farm a few potions of him by simply asking for some, dropping them then getting more.
I even went as far as to see if i could duplicate the bottle to make cloud in a bottle. I went in, grabbed a bottle, left, went to the nearest town with a safe or chest i could place items in, went back and it re spawned a bottle. I managed to do this for a few times and simply stacked them in the safe. I have 10 fully charged clouds in a bottle.
In the instance dungeons, ores seem to regenerate. I managed to make my own rare ore farm in one of those instance portals you use to make a house. I have a around 200 of each ore you can currently get within dungeons placed in it that i can mine, leave, come back and have most of it re spawn. That's how i made my obsidian gear and even made 5000 bullets and arrows.
6th was discovering the XP That doesn't exist.
7th, i managed to float over the big wall in the forest right after i got the leaf and even atop the part where the entrance was. There was sooooooo much blink root.
8th i killed the ice imp with a bomb
9th Tim the wizard spawned in an instance dungeon and i killed him. Along with a ruin wizard and lost girl. ( was pretty sure they only spawn hard mode but then i remember that i could also spawn and farm medusa and unicorn so....)
lastly i farmed the solders you can attack. They don't really fight back. You attack one in a group and only the one you attacked shouts at you. Should have it so that if you attack one that they all try to arrest you and if you kill one they come at you with deadly force.