Quote:
Originally Posted by Tywyll
I think that if the duration is staying to a minute (on average) especially if you allow other magic systems in the same game, you'd have to allow high skills to eventually drop the cost to 0, as you can in Gurps. There are still penalties for casting spells while maintaining others (-1 per spell you have active, so I'd guess that would be a -5%), I think there is still a self correcting element to it.
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Ah, I didn't think of that aspect (i.e. comparing with other magic systems). Then it makes sense to allow a really skilled mage to maintain spells at no cost. The skill penalty is not that large but a failed concentration roll (for example after an injury) would probably mean that all maintained spells are dropped.