It's not that bad once you get the hang of it! Also, The Indomitable is basically a joke once his damage is down. So as a sorcerer use fireballs to get his damage to almost nothing and then wreck his DPs with your mana shield. Just remember REGEN FIGHTING.
Edit: Yendor is an Elite Item (unlocked by Bazaar 3). It grants 50 experience and destroys itself upon clicking it.