[Soyweiser]

Damn, I was also working on that. I do know how to fix the arch seraph:

#selectmonster 509 --Arch Seraph
#shockres 100
#stormimmune
#gcost 0
#clearmagic
#magicskill 1 2
#end

And I just removed all the erronous spell data.

I didn't have a fix for the mind lord btw. It is a bit strange what is happening.

Change this:

--Fomoria EA

#selectnation 14
#startcom 1815
#startunittype1 1813
#startunittype2 1814
#startunitnbrs1 15
#startunitnbrs2 15
#end

-Fir Bolg Slinger
#selectmonster 1758
#enc 2
#end

into this:

--Fomoria EA

#selectnation 14
#startcom 1815
#startunittype1 1813
#startunittype2 1814
#startunitnbrs1 15
#startunitnbrs2 15
#end

-Fir Bolg Slinger
#selectmonster 1814
#enc 2
#end

This removes the double reference to the 1758 slinger.