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Just to also play devils advocate (I think it's good to look at both sides of the isle) if we do go the penance route, penance in 40k was always used to direct zealots into being good at crusading and fighting and zeal.
The Repentia of the Sororitas
The Death Korps of Krieg
Penitent Space Marine Chapters trying to earn their honour back
With the ongoing Mitu Cruade and the soon to be Rangdan Xenocide there are opportunities for Xana to cleanse itself in Xenos blood. But then we lose out on establishing the precedence of Good Works and Honesty.
Also because in case Talos is gone or incapacitated (Machine God forbid) it kinda sucks if Xana is stuck in that stupid mindset of "Oh we'll never ever be forgiven let's just focus on sending ourselves out there to die all the time". I mean its effective, but feels kinda bad they are trying to make amends for a sin done so long ago and not trying to reach to be better rather than simply be normal imo. Maybe we can say one crusade is enough to cleanse their sins though.
Hopefully neither of these choices are wrong/riskier in the long run and just give us flavor options
