Void Gauntlet will be the optimal filler weapon for light and heavy attacks. Its passives and additional crit chance make it the 'primary' weapon in this scenario since it will allow for more cooldowns to come back up if a critical hit were to occur. The range on the Ice Gauntlet is slightly father if long range attacks are necessary, otherwise the only time an Ice Gauntlet should be used for regular attacks is to set up a Heavy Freeze.