Aquablades is Fractured Blast, actually. Frustrating that the premiere builds website for this game takes 3+ months for what should be pretty basic functionality.
It's [Nezha] but they really went and made Blazing Chakram 2 subsumable and infusable. Why would you choose to spend your one helminth ability on what amounts to a second copy of an ability Nezha already has? Because sometimes it's fun to min-max for things that aren't objectively effective.
[Guardian] is probably more effective than Eruption, but Eruption is just funny.