I've been experimenting with the Theorem Arcanes, and kind of had an idea for another that could provide support build potential.
Basically called [Theorem Fever] and works like an Arcane version of Chroma's Elemental Ward, where standing in a Residual Pool grants benefits matching that element by a flat %.
Residual Boil: Bonus Bonus Health+Regen
Residual Malodor: Bonus Armor+Deflect chance
Residual Shock: Bonus Shield+Recharge Speed
Residual Viremia: Bonus Spring+Reload Speed
It would be pretty fun, and if DE were to go back to Deimos, I'd love for something like this to be added so I can go back to the Iso Vaults again.