My "Death Star" or Battle Ball, whatever you want to call it generally consists of Spirit Hosts up front in a Unit of 9 with x2 Spirit Torments, Lady O and others in the gooey center. Spirit Hosts with x2 ST.... Can tank some really crazy numbers.
My last game I played vs Slaneesh I was able to tank Slickblade Seeker Charge, Synessa Charge, Keeper of Secrets and Shard speaker charge all in the same turn. My Opponent thought by charging with them all into Spirit Hosts that he could just push through it. That was not the case. Seekers died, Synessa died, Keeper almost died and shard retreated.
Spirit Hosts held up until about turn 3 when my opponent got double turn and then support for them started dying off.