Warning: contains spoilers for Strange #2!
Marvel's new replacement for defender of Earth, Clea, was Strange's former love interest and now desires to bring him back from the dead (not an impossible feat, considering the sheer amount of superheroes who've died and returned - many more than once). But Strange #2 reveals that Clea's main difficulty with maintaining the power of the Sorcerer Supreme is that she already has considerable power - and absolute power tends to corrupt absolutely.
In the recent Death of Doctor Strange storyline, Stephen Strange was murdered by Kaecilius in a sneak attack right on Strange's doorstep. A time remnant of Strange from decades prior is magically conjured into being to investigate his older self's murder, and is shocked to discover his future holds many changes - among them, him and Clea were in a relationship that ended. Doctor Strange is eventually revived, but both him and his time remnant die to save the earth from the mystical destructive force known as the Child (essentially a magical version of Galactus).
With Doctor Strange's death, Clea is now the new Sorcerer Supreme of Earth, but Clea is quite different than her human predecessor. She is of the Faltine and has powers derived from the Dark Dimension, and this clashes with her duties. In Strange #2, Clea says "It's dangerous to possess so much power. The energies of Earth and the Dark Dimension are fire and ice. Acid and stone...the powers allotted to the Sorcerer Supreme do not add to one another. They do not combine - do not ally."
Clea is worried that too much power may end up corrupting her, a fate often shared by her people. Unfortunately, such a fate may be inevitable: Wong warns that Clea is ignoring her other duties as Sorcerer Supreme in favor of using all her energies to find a way to bring Strange back from the dead. She hasn't even met with the other Avengers and has yet to travel to Strange Academy; chaos has engulfed the school ever since Strange's death.
The powers of the Sorcerer Supreme and the Dark Dimension are seemingly incompatible with one another. Clea knows this and knows the dangers associated with holding too much energy from two different places, but continues to wield both. Readers are under no illusion that Doctor Strange's death is permanent; he'll inevitably return, but it's up to Clea to keep the world safe until he arrives once again.
