CC your enemies. Kill your enemies. Don't be in line of sight of your enemies. Be invisible to your enemies. Play dead. Make it nearly impossible for the enemy to reach you. Let your mage die, ressurect at the near end of the round as a ghetto Skin Graft.
You have a lot of tools and resources at your disposal to ensure that your experience isn't hampered.
But I don't have issues winning fights, I just feel like my mage isn't contributing as much as I was hoping.
