Odirile's Essence Conversion:

If successful, a random non-research node within your nation begins to transform into a Magic Node. It will automatically turn into a Magic Node after it receives Magic Points equal to half the amount of progress it would take to make a Magic Node, rounded up. The upkeep of the spell paid while it is transforming, and its initial cost does go into this progress requirement. The original node may not be used, or benefitted from in any way while it is being transformed. You may not put additional magic into the pool, and must wait until the upkeep for the spell finishes the node. (Ex: When turning a Wood node into a Magic Node (-/10 progress), 6 Nation Magic is already placed into the pool, meaning that it will take two sessions of upkeep for the node to transform. Once the node is transformed, the spell ends. Only one Essence Conversion spell may be upkept at a time.