How do I get past the pentagram boss fight? She goes straight towards me when she stops and I use my crux.
evade her. hope this little hint helps (didn't want to spoil all)
don't even attempt to hit her?
sure. then use crux once she stops. also you can use crux while she's 4 times around you - helps finding out in which direction you have to evade (she comes from the opposite side of where she is during 4-split mode)