Dwarvensphere.esp - what mod does it belong to?

[AugustaCalidia]

Does anyone know to what mod "Dwarvensphere.esp" belongs? I'm quoting the .esp name from memory and am a little fuzzy as to whether I've quoted the name correctly.

[Jeir]

Dwarfsphere.esp is the plugin for Project AHO.

[AugustaCalidia]

Thank you so very much.