Lighting bolt is bugged and not alot of units have it. Only two units I know of have hurl lightning and one of them is rare. There are a few lightning strike units, mostly DE. Yes it protects against static shield but that requires a specific situation with a opponent who has it/water one of six spheres.(nature shrine might give static shield though) Also lighting protection does little against static shield (maybe with a bit of physical protection..)
That means a decent portion of the value/use of natural lightning immunity is the ability to cast a spell like chain lightning when close to the enemy. Except static shield does the same thing making natural immunity unnecessary. So if they are on the same sphere that portion of the value of natural lightning immunity/protection goes out the window as well.
Problem with halo though is exactly the points you made. RMG its less, custom maps with lava maps (rare as they may be) its more. But its cost etc doesn't shift. Mountains/woodland/water on the other hand are found on most any map.
I do agree enchantments in general could use a little bit of a upkeep nerf. It can be so very painful just to keep a few enchantments on units. I suppose yes you can take them off when not needed as immediately & use them on less units. But then needs can arise very suddenly and taking enchantments on and off is a pain in the ass & slow(and isn't cheap in mana either and uses alot of CP)
It also reduces the value of taking multi-cosmo sphere pick. Since the main reason to do that is the enchantments and its expensive enough to keep the enchantments of one sphere.
I speak from a online perspective of course. Which is the way dwiggs is best. Its too complicated for stupid AI. So I think dwiggs should be designed for online or perhaps PBEM games, not SP games.
On the other hand. It does help with the fire halo/static shield thing since not every unit can have it in many a situation. And alot of structures give mana. But usually not nearly enough unless your loaded to the hilt with built up towns/magic shrines. Or you've waited a long time and built up a mana reserve that you can afford to to drain for a week or so to gear up for a major battle.(thus making dwiggs longer though)
On a similar note, and I don't remember if I made this suggestion or not but, wizard tower giving 30 mana. Not 30 research. (spell research could possibly be reduced a little as well in combination with that)
[This message has been edited by TruePurple (edited 09-15-2007 @ 01:43 PM).]