You want to get diamonds, right?
Items: Portal x1, power generation equipment (solar panels x3 + storm gun/thorium reactor x1 + some wires) , explosives x1 and lots of wood. /iron platforms.
The magma in the volcano will change depending on the person's position. When you enter inside the volcano and go down to a certain level, the magma rises slowly at that time, like magma. rises, it will rise a little, accumulate a little (be careful not to burn yourself) until the magma stops rising. Then follow the magma down, you will cross a relatively large gap (not the same gap as the pangolin boss, but it's much deeper than that), and further down you can see the diamond. First place the power generation equipment and portal nearby (not too close to avoid exploding), then set explosives to detonate. (don't forget to stayaway from each other when you explode) Too close), pick it up and teleport it. (The speed must be fast, so it is not recommended to use the storm gun, unless you find an open space to install solar panels or you are very low on thorium)
ps: Make sure to save more when entering the volcano, and press F5 more! Press f5 more! Press f5 more! If you are unlucky, you will die if you go in the wrong direction, or if you are ugly!
If you don't take diamonds, you can also use this method to get inside the volcano. There are only medium sized monsters and some sort of shrub inside.