Warps
Natural warps
Natural warps are generated as part of the terrain. They are immovable and can not be controlled by the player. The destination of each warp is predetermined in the world generation phase.
Natural warps are most common in a temple-like structure, with a slot directly above the warp sometimes containing a ruby. Putting a ruby in this slot activates the warp, and walking into the warp after doing so teleports you to the predetermined destination of the warp.
Natural warps can also spawn in clusters inside of tentacle rocks (I don't know if that's the correct terminology). Inside these rocks, warps are surrounded by corrupted stone with multiple rubies nearby each one. These can be activated by placing a ruby somewhere slightly above the corrupted stone structure that holds the warp.
Player-created warps
yes it is possible to make them, but I don't want to spoil how.