Its definitely one of the parts of berserker that I want to look into, it does work on some areas, but not where you most likely expect.
Please watch out when ull change it, alucard is not 100 with his berserker. i agree Cold steel need a buff but i think buffing it to affect spells will result in a huge nerf for pure melee build.
Here is a quote from Torchlight 2 wiki :
The only thing harder than steel is cold steel.
+X% to Physical Damage
+Y% to Ice damage
Though the tooltip says 'Only affects melee attacks', the ability affects all forms of damage as long as a melee weapon is equipped. It ceases to function if the Berserker switches to a ranged weapon.
Rank 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
% to Physical Damage 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30
% to Ice Damage 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90
Required Level 1 2 3 6 10 14 19 25 32 40 49 58 68 79 92
As u can see max burst from CS are 30 % physical dmg and 90 % ice dmg
Obviously if u make it work with active skills this will result in a huge nerf of ice burst dmg ( due to balance with all other classes ) i mean even the embermage doesnt have a + 90 % passive buff for his skills. So making the 90 % ice to a 30 % ice dmg apply on everything could look close to the balanced skill.
But as many high lvl melee berserker know the only way to upgrade ur dps is with cold steel ice burst that's why so many people in vanilla play ice shard dominator and enchant with ice dmg. Actually in synergie that's what i do too with my weapons adding like 200+ ice dmg on each weapon with ice enchanter in table mountain.
So lowering the ice part and allowing it to scale with skill will simply destroy some of the dps mechanic of melee builds.
THe soltuion could be a conditioned bonus like 30% physical and 90 % ice dmg (only affect melee) or 30%- 50 % ice dmg ( when using a skill )