Keep in mind that I haven't played the class beyond starting a world, trying out the first couple spells, and quitting. So maybe my point of view doesn't matter as much. Looking at the change notes, I noticed the new spell. It looks interesting, but I do have complaints about the tiers. As far as I can tell, the tiers are supposed to add some buffs to the items for dedication sake. On this, the tier 2 change seems like quite a nice buff, but then when you get to tier 3, it feels like you esentially wasted the entire journey to tier 2. Sure, I can understand the need for a nerf to a spell that's esentially giving you the ability to permanently stun unit(s). But that doesn't seem the right way to approach it.

As for solutions, seeing as I don't really know about the rest of the unit's kit, I can't give any. But I'm sure there are plenty of things you can do to it, like rework the spell to make it a slow (assuming he doesn't have something like that already) or reduce the size of the bubble at the third tier.