I'm playing a pure mage build (might try to do the thief/assassin quests when done with the mage quests).
Right now, I use perks sparingly. There are perks specific for fire, electricity, cold based destruction spells.
I'm wondering if one energy type fits all in this game. Should I just focus on electricity? Or do certain energy types work better against certain opponents? I think I read that dragons are vulnerable to cold, but ice-trolls are vulnerable to fire, so my suspicion is that I'm going to need to invest in all of them.
At the same time, is it wise to be careful with one's perks? I summon a lot of flame antorachs, but plan on upgrading the monster I summon to the next level (whatever comes after apprentice). So should i skip the perk that lessens the cost of apprentice level summons and just get the next one? Is that even possible? I haven't tried to skip a perk in a chain in the various asterisms...