So after the 5th try I finally managed to beat him and wanted to give some tips.
Boss Fight Guide
Love that the fight is hard and it is not a pushover, but there are some mechanics that even with good timing are quite hard.
When he goes into rage mode and gets electric attacks those can turn into your doom quite quickly. He has an attack where he hits the ground and it creates an electric wave. One of them is easy to dodge with a roll but he sometimes goes wild and hit the ground around 5-6 times quickly in a row. Shockwaves of that are extremely deadly and unpredictable.
To improve this maybe limit his usage of that to maybe 2-3 times in a row maximum. Range of those shockwaves is also a little big so you don’t have a chance to get out of range to wait out his rampage.
Another thing is that the shockwaves goes though pillars in that room, so you can’t roll behind one for a little protection.
That one probably is a bit harder to implement but it would be better if the pillars in the room break the shockwave so you can hide behind them to avoid damage.