Really great and addictive game, I love the very distinct classes and playstyles as well as the amount of control some items give you in creating amazing builds. Each enemy makes you think differently in tackling them as well as the sheer amount of keywords creating many engaging solutions for each fight.
[MILD SPOILERS AHEAD] However, I find the Hexia fight incredibly unfun as they seem to counter most builds and playstyles, which is so unmotivating as they are a common final boss you go up against. They have petrify to punish you for getting strong classes, spawning to punish damage over time, mana burn to counter any spell builds, pain mirror which forces you to run poison or range, unless you have infinite revives or valk (which got instantly petrified regardless).
It just seems like your run is instantly over the moment you face them even with a powerful build, when you go up against them compared to any other final boss. And its not like you can prepare for them either as the final boss is randomised and not shown. It just limits build creativity as it causes you to only run cleanse healers or poison for damage. Hopefully that boss fight can be tuned to show more weaknesses as other final bosses seem to allow for more variability.