The Ichorcloth Strapped Silverwood Wand Core is the best wand core available in Thaumic Tinkerer. This wand core holds 1000 of each type of Vis, even more than the Staff core of the Primal. To acquire this wand core, you must first have completed the research for Ichorcloth. Combining this with Ichorium wand caps and a full set of Ichorcloth robes makes for a total storage of 1000 Vis and a 36% Vis discount on all Arcane Workbench recipes. Due to its massive Vis storage capabilities, this wand core's Vis levels are very difficult to sustain with just Aura Nodes. However, this can quickly be circumvented with the use of the Experience Drain wand focus (unlocked after the research for this item has been completed) though it is recommended you invest in a Compound Recharge Focus surrounded by Aura Nodes as a back-up Vis supply.