What you want to do is hop first and then dash to get away from the wave and the attack. This isn’t too much of a problem in itself as you can easily dash from it, but every time Ixion commits a dash they also summon a red floor wave.
Here’s where things get really frantic though - Ixion will then pull out a blade and start dashing and slashing at Selene. Keep your focus on the blue wave and keep dodging in and out of the projectiles. Use the Car Key on the door, and you will be treated to the real, secret ending of Returnal. Beat the boss again, and head toward the sedan. In Phase 3, Ixion will return to his blue state but also start firing projectiles from above. Now, you will need to make your way to Ophion once more. Dodge, but be careful where you’re going when you do. Ixion will then start firing a blue beam much like Phrike, but will complement this attack with tiny homing projectiles. Ixion’s projectiles will become very difficult to avoid here, at which point you want to try and dash through them. This part is tough, but if you stay still until they come flying in, you’ll have a better chance of understanding the attack and dodging it. After a short period Ixion will return, but this time they’ll start dashing through the arena. You want to maneuver yourself to his front too so you can do the most damage possible to Ixion’s head. Head to the outer rim of the circle and focus on leaping over the blue waves. At this point, the whole boss fight will change. In Phase 2, Ixion will then smash into the ground and power up their tentacled arm. They’ll dash and shoot out blue projectiles, and you should use the entire arena to your advantage to beat him, circling the outer rim so there is more space to dodge. A good weapon to go into this fight with is the Hollowseeker, as it allows you to dodge projectiles without really needing to think about aiming too much. As long as you’re constantly moving, Ixion can’t really do much to the player in the first phase. Ophion, like the other bosses in Returnal, has three phases when you deplete its health bar, it will move onto the next more difficult stage of the fight.