Baalth is a very slimy sort of character, being someone Frank flat-out does not like and very much the deal-maker sort of Satanic Archetype but you just can't help but feel a sense of respect for him after he ends up winning everything at the end of Armageddon Bound after all of the heroes' efforts just wear down his enemies.
Resurrection
Frank manages to take down Lilith, Daartan, and Daartan's revenants, which may be a mixed blessing given it comes with the resurrection of Longinus but shows Frank is moving up in the world.
Karra not only kicks the ass of everyone she's fighting but Daartan—who is the Scourge of Heaven—she successfully succeeds in her plan to resurrect her father.
At The Gates
The effortless way the Metatron hands Gabriel, Michael, and Azrael all of their asses.
Frank manages to achieve one on his own, being only barely a Badass Abnormal versus an Archangel yet figuring out a way to defeat Azrael.
Echoes of the Past
Frank, after millennium of being a butt monkey, is crowned King of Hell.
Beyond the Veil
Frank manages to kill one of the Old Ones after denying him his prize of Longinus' power by killing Longinus.
Frank manages to avenge himself on Baalth after books and books of manipulation by him.
Exit Wounds
Frank binds Azrael's spirit to a goat and then banishes him to a prison dimension for what may not be all time but is likely to be a very-very long one.
