That’s the perfect example. The whole arcane magic in Dark Sun is divided between preserving and defiling. The harder, rigorous pact that is not destructive to the environment and the easier, but “darker” pact.
And… boom, this “sun wizard” crap that has awesome powers that brings no harm to the environment, and of course only she, the special snowflake, can use. And even before that she was full of “invincible plot armor”: she’s no psionicist, yet she was able to defeat Nok (who was depicted as superior to Agis, a master of the Way) in a psionic combat.
And let’s just remember how she acquired that power… A mid level wizard in a quick trip to the Pristine Tower became that awesome Sun Wizard, able to wield magic more powerful than the freakin Dragon’s. The Champions, otoh, were trained by Rajaat for ages, then they were empowered by him (not by his servants) with the powers of both the Pristine Tower and the Dark Lens.
That’s why the Sun Wizard’s powers, the “immunity to champion sword”, etc to me are just “deus-ex”.
Ok, sorry about my rant