Adamantite

u get that in the 25 floor

if you cant get to floor 25 you need to bring alot of food into the mine,and whenever your stamina goes down halfway,eat food until its almost full,then continue! but at floor 20,use your hoe to look for stairs,if u wanna b safe,save every time you go down a flight of stairs.!^-^

actually it's on the 25th floor and above. what you need to do is to get a bunch of colored grass, blue, purple, and indigo are best because they restore stamina a lot. get about 10-15 of each and eat 1 of each when your stamina gets under half. hope this helps! I actually made it to the 102nd floor with something like 35 purple grass,41 indigo grass, and i think 34 blue grass. And i mined a ton too!

Ok don't dig, if you take tons of food with you ( to keep up your stamina) and just destroy all the rocks there are pitfalls! You run around and sooner or later your on freakin floor 80! (dramanisation)

Go to van sope and get the gadness hat and thend you can do it

Ok what you do is you grab as many grasses as you can a few days before you plan to go out so you don't run out of stamina.

Then you mine and only eat the grasses if you need to.

KEEP WATCH FOR PITFALLS!!!!