First of all i am playing ars magica 2 for minecraft 1.7.10, mod version 1.4.0.006, i tried to make an spell but in the middle it say's
"500x Essence ( Neutral )"
I was playing on creative, so i search for the "Neutral Essence", i didn't find nothing, i look on internet but all information was about 1.2 version or lower, i look at "Obelisk" in Compendium and tried, it use the vinteum dust but don't charge the crafting altar ( I have linked them ), do someone now how i get Neutral Essence or just use it in the spell?
In case anyone is still wondering about this, place an Obelisk near the Altar, then use a Crystal Wrench to 'pair' it with the Altar block (right click the Obelisk, then the Altar block). Put Vinteum Dust in the Obelisk, and flip the lever on the Altar (perhaps not needed).
That should satisfy the spell requirements and you'll be able to move onto the other ingredients. Safe spellcasting!