[X] Turning A Bloody Leaf: The Asrai do not disdain Khaine as the Asur do. Rather than elevating the Cadai or Cytharai, they worship both, in a sort of strange wheel of all things as best as you remember. Which means that, while they do not have the Cult of Khaine with its Cauldrons of Blood and endless sacrifices, they do still in fact have their ways of worshipping him. Ways that are quite different. Kerillian now wields the First Draich, one of the holiest murder weapons in the whole of the Cult of Khaine, and it appears to not be rejecting her. It would disgruntle the Asur, assuredly, and no doubt the Bretonnians as well, but if Kerillian can somehow 'convert' these few incredibly fresh-faced acolytes to your cause, you can't deny that it would allow you access to a few more no doubt skilled fighters despite their youth. If they foreswear the Cult they know, in the favor of the worship held beneath eternal trees and dark shadows of a forest born before humanity may well have ever existed. If. If they don't, they'll have to leave. If they do, the Asur and Whitewings will likely not be incredibly pleased...but so long as Sadrina's heart bleeds compassion and Roland can impress on matters of honor and chivalry and the worth of one's word, it is a problem that can be solved.
[X] A Bloody Hand: There remains resistance to the Cult of Pleasure on the Ark, but one of their greatest opponents was practically dead before the fight even properly began. The Cult of Khaine was nearly destroyed at Salkalten, and was again brought even closer to the brink in the aftermath, leading to now, with bare handfuls of incredibly young acolytes all that remains. But many Druchii outside of the Brides of Khaine worship Him, for he is the utmost God championed by the Witch-King himself. A rallying force, wielded by the deadly Kerillian, could be just the thing to start truly tipping matters against the currently mostly dominating Cult of Pleasure. But it would require Kerillian to leave and be amongst the Druchii, alone, for there is no chance that a bunch of freed slaves would be able to make common cause with them, let alone with the Handmaiden Sadrina in tow.