Evoland Legendary Edition

Beating this boss will show the credits and dump you on the title screen, but you can continue your save after beating to collect stars/cards/side quests.

There are three parts to this boss:

Part 1 - Zephyros will slam his hands down on the ring. You need to do your best to stay on the outer side of this ring to avoid the laser he blasts from his face.
While he's firing the laser, attack his hands. You'll generally do two attacks before the laser finishes. Once you've destroyed his hand, the purple light will go out and you'll need to do the same to the other hand, bringing you to the next section.

Part 2 - Zephyros will fire a laser and spin around the ring - sometimes the laser is unavoidable. Listen to him firing and you'll hear a sound that will play 5 times before the laser stops firing and he'll be standing still for a few seconds, where you need to hit him once, then run to the other side of the ring and hit the pink sphere.
What you need to essentially do is run in a circle while he's firing the laser, doing your best to predict the direction he'll go in, then as the 4th/5th sound plays get close to him so you can run to him and hit the purple eye once (and only once). Then, run to the pink sphere on the other side and smack it a couple of times. Repeat and you'll end up in the next section.

Part 3 - Zephyros will come out of his stone shell and fire two different coloured orbs at you - pink and blue. If firing pink, run away, if firing blue, attack it to shoot it back at him. I typically stand still until he fires before deciding if I should move or hit, as I found constantly running in circles to either make me miss the blue, or get hit by a stray pink. I believe it's 5 blues to kill him. This one is unfortunately quite luck based as he might fire 5 blues in a row if you're lucky... which is what happened to me :)