Ok just bumped into @Murador on the ladder and after the game was basically over we decides rather than just ending it we'd play around with a few things...the main one being Eldritch storm.
The conclusion- it truly is utterly useless.
I'll be quick.
the damage is just enough to kill an unupgraded dire avenger squad if you sit on it for the full duration.
it's only really useful for the slow in this form...it has some use if you have already won a battle - but if you throw a banner down on you SM blob on top of the already large healthpool then just ignore it unless the fight is on a knife edge.
Conduit form -
-The damage is actually pretty poor and single unit as well.
We learned something new - if you stand in the centre of it then it can't target you...
So in addition to being the least harmful of the ults it also seems to have the most counter plays....
Meh ....please change this relic.
Eldritch storm....in a teacup.