Right now, there are two normal/shadow armor sets (skelly and angelic) and they both are weak to fire. This makes both of them undesirable compared to other non-shadow armors and it also means that there is no tier 2 shadow armor that will protect you in a fire/fiend or fire/undead level.
I propose that one of those armor sets lose its fire weakness. It can gain a different weakness instead, or, to bring shadow defense sets more in line with the elemental and piercing sets, it can have no weakness but only one resist instead of two.
there are two normal/shadow armor sets
http://wiki.spiralknights.com/Deadshot_Mantle
http://wiki.spiralknights.com/Deadshot_Chapeau