He is all about area damage and disable, so hit as many heroes as possible with each ability while positioned at the edge of fights.

Use Liquid Fire on towers during every push, the burn and attack slow make him one of the best structure pushers.

Ice Path is a long range stun, so open with it then follow with Macropyre, Dual Breath, and Liquid Fire to melt trapped enemies.

Spam Dual Breath on enemy heroes to slow their attack and movement, letting your carry lane freely.

Avoid hitting creeps with your AoE early if your carry wants to farm safely, your spells push the wave otherwise.

Good positioning defines his value, build Force Staff and Glimmer Cape so you can save allies and survive dives.