Bone Spirit as a missile is only barely OK on LOD Scythe / Pestilence (as a replacement of Bone Spear).
Rathma is expected to be a pure pet set :
Also Bone Spirit could be completely reworked as a buff skill to avoid having another (useless) missile skill.
Last suggestion, the shadow clone pylon could be integrated as a core mechanic, in the main game, like any other pylon. Just need an icon on the map & translations for the name of pylon.