How do you find the crazed druid's antlers head item? Someone told me its a grove pattern item but I dont know what that means?

you need a) the lost grove, b) the barracks built, c) the blacksmith built IN the barracks, d) to fight the Crazed Druids in the grove, e) to get that lucky RNG that gets the drop of the item scematic, and f) all the materials that will allow you to make the antlers using the schematic at the blacksmith

Ah ok thanks!