Is spell dmg worth at high levels?

[MaxWilson]

Correct, it does not stack. Why do you bring it up?

Apparently I got the wrong impression from this quote:

4) Accounting for their (low) Int saving throws, Synaptic Statics deal over 75 average damage each (between the 3 of them), plus totally screwing the attack rolls of these melee-reliant foes.

It sounded like you expected to impose a huge penalty (3d6ish?) on attack rolls. I guess you really just meant that your AC is good enough that 1d6 is a relatively large penalty.

Good point about the Manglers vs. Darkness.

Once Wall of Fire is up, what's your plan for inflicting damage, in the "only 2 short rests" scenario? Can't Eldritch Blast now because you can't see the target. Synaptic Static? You may hit the PCs too (depends on positioning but it's only a 20' x 40' area) and penalize your own concentration saves.