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Radiance I still think is pretty dumb. Sit very safely away from the action and kill pretty much anyone who's not put lessons into mini skill, and those with no viable way of getting out (especially with orb). It has its uses to get people away from their main groups of course, but I still think there should be a smaller range of use for it.
Building for telepathy does nothing to boost radiance. It's the same whether you have 0 int or 30, afaik. So a mercenary troll is just as annoying with radiance as a grook.