You should just type in Disruptor-kinetic field in yt.
It`s basically just a round wall that stops enemy movement. Less cc than vortex bombs but much longer duration. The enemy and knight attack would pass it and knights would easily pass the walls.
Radius: a bit bigger than vortex bombs
Duration: 4 seconds? (discuss it)
Damage: minimal
Crafting path: maybe from 4* shadow vortex
Usability: when you want to hold that trojan in one place for a bit
It won`t be op because enemies can still do dmg to you and you need to be aware of them.
so, a different freeze that can pass shields.
how about you just craft a freeze mist bomb?