Lahkesis and Atropos
This is a toughie. After introducing herself, Lahkesis come at you with spear attacks to start with, and some blasts from her staff. Alternate between slicing her with your blades and deflecting her blasts. Eventually, she'll start floating higher up, forcing you to change tactics.
She'll blast you with her staff, slam herself down, and electrify the floor. To avoid all these, you need to keep jumping, and when she takes the floor out of action, use your grapple to swing above it. She'll fire at you in mid-air too, so keep moving between grapples to avoid her shots. The best way to bring her down is with your bow, and by deflecting her shots.
Finally, she'll hang in midair- ready for a beating. Grapple up and swing into her while pressing Circle and you'll get the Quicktime event to finish her off.
That's far from the end, though. Lahkesis still has plenty of fight left in her, and she tags in her big sister Atropos to take a crack at destroying you by destroying your past (why she brings you along to watch is anyone's guess). Don't worry, this one is much easier. Use Cyclone of Chaos on the grunts that appear, and whenever you get time, fire arrows at the Sister. Repeat until she slumps onto the sword - letting you finish her with a Quicktime sequence.
Finally, you'll face both sisters at the same time as they make a last-ditch effort to stop you. This fight is the same as before, only with a twist. Atropos appears to vomit energy beams at you every few seconds, so you need to be quicker on the dodge. Lahkesis is your primary target, so focus your attention on her. Once she goes down, freeze time, and smash the mirror with Atropos in it. Once you've broken the two at the sides, hack away some more and you'll finally get a Quicktime to finish them both.
