ON THIS WIKI
The infusion altar is a multiblock structure added by Thaumcraft 4 that is used to infuse items and vis into an object to create another. Infusion in Thaumcraft 4 is 100% different than in Thaumcraft 3 making it more challenging.
When using the Infusion Altar, there are some things to note, the Arcane Pedestal in the center is where you put the object that is being infused. The outer pedestals are used for the objects that are going to be infused into the center object. Vis for infusion now comes from Alchemical Furnaces instead of a Crucible. The Vis, or now called Essentia, can be stored in warded jars for use in the alter. They can be moved from the furnace to jars by the way of Essentia Tubes, by a Golem with a Golem Animation Core (Alchemy), or by Phial , which is also used in the crafting recipe for scribing tools.
More information can be found at Tutorial:Infusion (Thaumcraft 4)
Arcane Stone Block
Arcane Stone Brick
After these have been made you need 2 more items:
To complete the construct simply right-click the Runic Matrix with your filled wand.