Frozen Fate (1 Skill Point): Adding single point to this skill provides chance to freeze additional enemies whenever you kill an enemy.

Astral Ally (15 Skill Points): Summon partner to assist you in unleashing more damage to enemies.

Ice Prison (15 Skill Points): The skill traps your enemies to protect you or party from incoming threats.

Downside of this skill is the shorter duration and longer cooldown. At higher levels, it also provides bonus resistance to slow, resistance to immobilization, extra mana charge, and faster cast.

Elemental Boon (15 Skill Points): This is your power up buff that increases elemental damage and resistance.

You don’t really need the damage and other effects of this skill. One skill point is almost perfect for this skill. You can travel faster, instantly escape danger, and chase enemies better.

Frost Phase (1 Skill Point): Basically, you are going to use this skill to teleport.

It also complements with Elemental Attunement and Prismatic Rift.

Fire Brand (15 Skill Points): This passive makes your Prismatic Bolt deal more damage when you hit burning enemy.

Elemental Attunement (15 Skill Points): The passive skill helps your Prismatic Bolt to proc more Fire Brand, Ice Brand, and Lightning Brand.

As much as I want to max Charge Mastery, put only 9 points to give more on other priority skills.

Charge Mastery (9 Skill Points): Lets you gain charge faster and retain it longer.

Vitality (50 Stat Points): Put few points here so that you won’t die easily especially if playing on elite difficulty.

Focus (395 Stat Points): Invest lots of points in focus to inflict massive elemental damage.

Dexterity (50 Stat Points): Put some points here for increase critical hit chance, dodge, and fumble recovery.

Embermage build torchlight 2