when did mage become the support class

Anyways good guide, may also want to add that getting light as 5th skill would be effective against bosses.
Also personally in 2/5 in heal is more than enough(empower only)

getting the mana is useless as empower heals mana bar to full for rogues and tanks and the minuscule heal and mana you get are just terrible and should go into getting more skills for being versatile. Also if you get the heal over time and mana over time upgrades your heal attracts aggro.