Having trouble with the final boss? I gotchu. (spoilers ahead!) The first phase is probably the hardest imo. He will constantly fly around seemingly randomly and launch attacks at you. You should try to hit him during this, but you probably wont be too successful. The best openings are from his attacks (duh). The ones that I personally had the most trouble with is the one where he quickly creates a pillar of jade to shoot at you and the one when he creates and drops little jade stars.

To dodge the first one, the indicator is the verdant tablet will quickly go to one edge of the map. Once you see this (it may take a few tries to get the timing) jump and use your teleporty thing (i forget what it’s called) diagonal and forward. If you do it correctly you should be able to get at least one hit in. For the jade stars, just position yourself to not be in line with them, and you'll be fine. For second phase, the only thing I can say is be patient. If you rush, you risk dying quickly. Make sure you have somewhat of a clear path before advancing to hit him. For last phase, there are only three attacks to learn.

The one where he shoots some balls at you, creates the pillars, and then creates the ones with openings to go through. For the ball one, wait until he finishes summoning his first few and run to one side of the room. Once on the other side, you'll have to jump and use your ability to go through a gap between the balls once they corner you. Once you practice this enough, its consistent. For the pillar one, wait until they get short and then jump and use ability to go diagonal up. Repeat until end. For the next attack, always use ability so you can dodge the balls while he's shooting at you 100% of the time and go through the gaps.

For the last part when you're falling, always use your ability to go through the gaps in the laser balls and quickly grab another one to charge. This stays consistent throughout, and even if you dont do it perfectly, you have three hitpoints for a reason. After this, you can just hit a few times, and then you've done it! Hope this helps.