1. Never turn your back on a warp spider
2. Especially never turn your back on a Pheonix lord
3. If your stupid enough to break rules #1 and #2, DON'T FLIP HER OFF!
It doesn't matter how tough their armor is, projecting a warp into an armor seam then diving into the warp with 4 scythes is a great way to crack that petulant egg!