Hey guys i need some help here and any wud be greatly appreciated please, im at chapter 18 and im having difficulty defeating the chaos emperor 2, i only have 9 arrows and 4 fire shiryukens, are there any merchants close so i purchase any more or does anyone have any strategies to beat this boss, are there any super effective attacks that take down major life from him, thanx in advance

No Muramasa shop. Equip art of the fire wheels and use it until the head comes for you, then roll away and wait. If he jumps then less than 50% of the time he'll jump on land. If he does, fire wheel him, otherwise keep on going(make sure you have max on devil elixirs).

Art of the Inuzuma is much more effective.
But when the skulls lash out, that's you chance to deal some damage, just bust out the Flails and get smashing.
If you have, I'd say 5 days you can use regular shuriken.
But if your fast, have plenty of Elixers, plenty of Devil Elixers, and good timing you should be able to baet him without using arrows.