To obtain Smelz armor, you must first have 150 tinkering. Then, place 150 trinket tokens in the cube along with an iron version of the armor you want, such as platemail chest or chaos shield. Double click the cube to enjoy the nostalgia of Smelz!
3x Lesser Essences of Corruption and 140 tinkering will grant you 1x Essence of Corruption
3x Essences of Corruption and 150 tinkering will grant you 1x Greater Essence of Corruption