I'm sure this has been asked a million times before, but I'm lost. The PH says arcane spell failure exists because armor hampers the character's ability to use somatic (gesture) components. If a character casts a spell using the Still Spell feat or the Illumian Naenaesh runic ability, does the chance of failure still apply?
I think it doesn't, but a friend of mine cites that crystal armor from the Arms and Equipment Guide which lowers spell failure but is bulky, hindering, and weighs twice as much as normal armor, but "conducts magical energy more easily than metal". This would suggest that it's something about metal reflecting/absorbing magical energy.