On the other hand the firmir where more on the tzeenchian side, we had a possible encounter with a servant of Horstman(Tzeench) and yet we are not to ambitious.
But consider what Erika wants out of life, that is to enjoy it , and while her ulrican nature makes her enjoy combat for now she is here for a fatherly visit and all to often her actions are based on companionships and to enjoy those around her. Possibly as a reaction of having been cast out by her own family. I mean look at the way that she tends to fall for steppy older women on an Oedipal complex.
It would be to easy to read this as the prince of pleasure, but I would argue that perfection is not what she is after right now, It is family. And so grandfather Nurgle and his call should feel more appropriate to her as that also allows us to explore his slightly less puss laden side.
And look at what it might mean for her to make a mistake to lose corruption. Taking a step away from duty to enjoy friends is far more in character for her then to betray people for her ambition, or to flee from combat with the forces of darkness.
[X] Serenity. Peace, at last, is the only prize worth the name. You rest beneath shadowed boughs, swim through shining currents, live and laugh and love with friends and those closer still.