Skyre and the destruction tree

[Cactuspunch]

So, I need some help with the skyre destruction tree, primarily what path to take. You see, I am role playing as a Altmer
slightly evil necromancer who allows her minions to attack enemies, and backs them up with using destruction magic and various curses and plagues.

 

Now, as my character is obsessed with death, I feel that focusing on frost magic would be more in character, as it sort of fits with the whole "embracing the cold hand of death" theme i am trying to go with. I was wondering if it would be better to focus on fire magic instead, as half the enemies are resistant to frost. However, the do work very well on humanoid worrier types who do tend to mess me up a lot.

 

Or would it be better to skip the whole focus on one branch of destruction, as I am not a pure destruction mage anyway, and will really more on back up.

 

 

 

TL;DR: Should I stick to pure frost magic with my necromancer, change to focus on fire or shock, or not worry about specialization