ARMOR PROGRESSION
Diamond can get upgraded to Tungsten, which armor has less toughness than diamond but more armor, and the tools deal more damage + have more durability but cannot mine diamond pickaxe level ore.
from Diamond, you can get Steel, which can be upgraded into netherite
from Tungsten you can get Electrum, which can be upgrade into Necromium
Electrum gives a speed boost, but has less armor values than Steel, and Steel makes you slower
Necromium can burn in lava and has less knockback resistance, but gives enemies a weaknes
BOSS / CAVE PROGRESSION
Not entirely nescessary to follow in order, however you do need eyes to unlock the end and this is the intended way to get them. Cave tablets now drop from certain mobs / bosses, and the Spelunkery table is now only made through crafting
MAGNETIC CAVES
Magnetic Cave tablets drop from Deepers, which are Creeper like enemies found in caves. You can use the materials found here to craft a Storm Locator Eye, used to find Scyllia
SCYLLIA
Drops an eye used for the ender portal, and also Abyssal Chasm cave tablets
THE ABYSS
Materials used in this biome are used to craft a
THE LEVIATHAN
Drops an eye used for the ender portal, and materials to find the Ancient Remnant
ANCIENT REMNANT
Drops an eye used for the ender portal, and Primordial Cave Tablets
PRIMORDIAL CAVES
Where the Luxtructosaurus resides, which drops an eye, and where you can find the materials to make a Monstrous Locator Eye
NETHERITE MONSTROSITY
Drops an eye used for the ender portal, and the Candy Cavity Cave Tablets
CANDY CAVITY
Where the Gum Worm resides, which drops an eye, and where you can find the materials to make a Mecha Locator Eye
THE HARBINGER
Drops an eye, and Nuclear Cave Tablets
NUCLEAR CAVES
Materials in the cave are used to craft a Cursed Locator Eye
MALEDICTUS
Drops an eye, and Forlorn Hallows Cave tablets
FORLORN HALLOWS
Houses the Forlorn, which drops an eye
END
VOID WORM
IGNIS
VOID SORCERER