Still thinking about it pretty heavily, but basically it would go something like this:
Avarail is freed from his prison. The contingency goes off, and his foe is resurrected. While Avarail is getting a guided tour of one of the largest cities on Earth by some very knowledgeable folks, Kraldor the Vengeful is probably alone on a plain, confused, disoriented, and very, very angry. Avarail meets with a world leader while Kraldor is busy sending out divinations to figure out his current situation. While the UN is being called in an emergency situation to deal with 'Holy fuck, monsters everywhere.', Kraldor is torturing and interrogating some poor folks to figure out what exactly the hell is going on. Once he realizes what exactly is up, he's going to go to the nearest world leader he can find, or perhaps the least reputable. Or maybe the most powerful. And he's going to either try to convince them to do as he wishes, manipulate them into it, or straight up control their mind.
And then things would get complicated. If the setting itself is set twenty or so years after the reemergence, then both factions would be fairly entrenched and engaged in massive warfare with one another. Any time Kraldor or Avarail deigned to take the field, whole armies might be wiped out in minutes. Which would make it rather interesting for any adventuring mercenary that decided to get involved in one particular side or the other. Not to mention they might get high enough within a certain group to meet Kraldor or Avarail, both of whom have incredibly powerful divinations at their disposal, including stuff like Detect Thoughts. Hmmm.