I need to clarify. The spell would "refresh" the concealment effect every time the environment you're blending into changed, whether its because you moved or the lighting conditions changed. The "speed" would be how fast it refreshed back to full effect. The game would recalculate your level of concealment regularly while the spell is in effect, adjusting for such things as moving or lights, the "speed" would be how fast the spell compensates for these changes.
That sounds good; not sure if it could be
well implemented in game, but sounds good to me.
100% chameleon absolutely made stealth obsolete other than the sneak attack multiplier - I can't see how you can seriously argue otherwise. I'm all for a variety of play styles and choices and I don't mind magic being used to enhance stealth as I'm no purist and think it makes sense for all builds to use some magic. But illusion really did make the sneak skill near obsolete due to invisibility and chameleon - and not in a very fun way either. When one skill does what another skill does in a superior way and is useful for other things I consider that an issue - no skill should be nearly worthless.
I dissagree completly; first, sneaking has no time, you can sneak as much as you want, while chameleon and inv only work for a time and rely on recast.
Second, invisibility only worked if you didn't perform any action.
Third, at least until Oblivion, you can choose the way you want to play, so you don't need to choose illusion if you don't want to take out any major skill.
Fourth, the problem came with Oblivion, where our magika recovered with time; in Morrowind you had a pool and, unless you waste a potion/rest, you used to savewise magika.
And last, playing wisely a thief-like character would hardly get a 100% chameleon spell, since it's lower versions doesn't have a chance agains sneaking, so you'd spend a lot more time sneaking than using chameleon.
It relys a whole lot in playstyle more than "effectiveness"; I don't play
the best race with
the best birthsign and
the best skills and weapons/armor, I play the race I like, with the birthsign I like and the skills, armor and weapon I want to use for that character-type. I use to play as a breton, for sure not the best option for a stealthy-magic assassin; I could well use illusion instead of sneak or security, but I wonder why... My character wouldn't use them, so don't I.