This exotic is a cool concept but could have been executed much more deeper.
The class ability should become a grenade naturally without the need to change it but the barricade should have been elemental versions of both Light and Dark dependent on the subclass equipped.
Solar: Sunspot
Arc: Storm
Void: Black Hole
Strand: Weave of Threadlings
Stasis: Glacier or Duskfield Grenade
You could take a step further and change the layout plus elemental concept based off which barricade you chose ie Stasis Rally Barricade = Duskfield while Towering Barricade = Glacier.
Just a thought to improve the exotic.