The Burnt World of Athas

The official Dark Sun website

Psionic class - The Mystic

Wizards of the Coast has released an Unearthed Arcana article called the Awakened Mystic. It appears to be a partial class called the Mystic with a few features from the class. The class seems to have some interesting mechanics and takes on psionics. What do you think of its use of concentration?

EDIT: They've updated it with the full Mystic class, up to level 5