Most of this has been said before but I'll reinforce it I guess lol. Galaxy sword, lots of high quality cheese (for health regeneration), a good deal of spicy eel (for speed and luck), some triple shot espresso, up to a full inventory slot of staircases (if you don't care about not using staircases for Qi's quest), as many bombs as you can XD, and some choice rings. (I like the napalm ring and the iridium band), and obviously a good pickaxe.