All the Critter types spawn spontaneously in their respective biomes, and can be captured. Gem Critters are considerably more valuable than most other Critters. They begin to spawn when there are three or more NPCs in an area that is within the Underground or Cavern layers. All the "basic" ...
...or go to a Crimson/Corrupt World and farm those and have all of them at once! Keep in mind you can also make these biomes in your main world, just like any other. If you're melee, make use of the great flasks available via the imbuing station. There is so much in this game...
Each cabin has an address in the network. For example, bottom-right tier 5 node has the address "yellow-green-yellow-blue-yellow". To get the player there, The computer performs serial activations of all links of some color. The link is a bundle of 4wires, connecting 2teleportersin diffe...