hey guys so yall have all helped me through a lot of bosses and this one simply eludes me i can get to where she is the only one left but somehow she always survives even if i watch i don't understand how she pulls this feat off i have 7.1 million power and this is the form i use:

x,x,valla
x,blademater(main),ahmos
x, cianna, shayd

any suggestions?