I was considering what I'd like to arm her with from the Relics and I think the Excruciatus Flamer works best. A Great blade isn't a bad option as she is serviceable in melee but we have Custodes for that

The Excruciatus Flamer gives a guaranteed 6 shots every time which all automatically hit, at Strength 6 and AP-3. That's actually fairly spicey and alongside a squad of Witchseekers jumping out of a Rhino onto an enemy near an objective, using Purgation Sweep to boost them to S5 and we have a really astonishing assault.
Any other combinations people are considering? I feel ghe Raptor blade is a trap, since going from S5 to S6 isn't the big deal on her whilst Custodes are around to do the heavy melee lifting. If we stick to the Great Blade as a charging option after a Purgation Sweep to take an objective however, the Enhanced Voidscreen Cloak would be very beneficial. It actually gives a Knight Centura a chance to go toe to toe with enemy Elites and come out the other side.
Oh, for those who might have missed it in the leaks (like me as I avoided it a little to enjoy the book release), the Daughters of the Abyss rule is delicious for fighting Daemons as well as Psykers. +1 to wound, combined with Witchseekers using Purgation Sweep and a Knight Centura giving reroll 1s to wound means:
• Wound a Hive Tyrant/Greater Daemon on a 4+.
• Wound T4< Daemons and Psykers on a 2+.
• Wound T5 Daemons and Psykers on a 3+
All with reroll 1s to wound

The Knight Centura gets that with her S6 flamer as well, remember, so can get 6 hits that wound on a 2+ and -3 AP against Eldar, Grey Knights and Thousand Sons infantry.
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The main benefit to take this character as far as I can see is the following:
i) Accompanying a unit of SoS in a Rhino/on foot.
ii) Counting as a 2nd SoS unit for -2 to enemy tests. She also doesn't mind as much being up close to the opponent's Psykers in the right build so can make use of Psyk-Out grenades and Creeping Dread (though the latter is likely to keep your SoS alive from enemy retaliation).
Edited by Captain Idaho, 16 January 2022 - 01:10 PM.