This is a RPG Maker MV plugin that adds a “Concoct” command to any actor you want in battle. Concoct allows the actor to combine together two items to make a new item effect. Concoctions will be composed of a primary component, secondary component, and a resulting effect.
There is also an Item Concoction Preview Window that comes with this plugin. It can be enabled or disabled (up to you). It will display the resulting effect of the two mixed items together if the concoction combination has been made before. If it hasn’t, the effects will be hidden.