I suggest allowing GSF: Illusion and ESF: Illusion to increase the duration of the invisibility effect of spells that grant it, similar to how transmutation focuses increase the duration of Aura of Vitality. The same model of 3 rounds/level with GSF and 1 turn/level with ESF could be used for invisibility.
I think that a change like this would make the illusion school much more appealing, in addition to allowing illusionists a cookie that makes them more obviously in control of things that are pretty central to the illusion school, even if setting it to less than turns/level.
Grant longer invisibility with GSF/ESF Illusion
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Re: Grant longer invisibility with GSF/ESF Illusion
Sounds good to me!
Approved. (for a moderate increase only)
Approved. (for a moderate increase only)