To create it, you have to right click a Runic Tenebris Frame with a Dark Nether Star.
To get it, you need to right click normal Farmland with Arcane Crystal Dust. Magical Farmland doubles the quantity of crop drops.
You can create one by throwing Dark Matter together with Corrupti Dust on the ground. It will attract items and delete them. It also collects Experience Orbs and once it absorbed enough, it will throw out a Xpetrified Orb.
The Edelwood Ladder can be climbed twice as fast as a vanilla Ladder. They are craftable like the vanilla Ladder with Edelwood Sticks and a Edelwood Planks.
Not implemented yet, but it will be an important block in the future. You should already collect some Stellarite Piece for it.
Arcane Crystal Obelisk
Create it by placing two Arcane Crystal Blocks on top of an Arcane Polished Darkstone and right-clicking one of the three blocks with Mundabitur Dust.