Okay, so, we are definitely unsure on exact numbers for the Banishing Rebuke, and these are both very much at the low end on both Odr and Orthstirr (and will likely go up a lot), but I thought I should post the general plan, those numbers aside. Numbers on the Rebuke will be adjusted as per what IF says in response to my Reward Die.
[X] Plan I Think You Need An Exorcism
-[X] Stoke Frami (+220 Orthstirr)
-[X] 46d6 Attack (34d6 tricks)
-[X] 65d6 Defense (65d6 tricks)
-[X] 0d6 Intercept
-[X] Sling our Bolt Thrower, pull Sagaseeker and move into melee
-[X] Activate Stoker State 3 (-9 Orthstirr), Slipstream (-8 Orthstirr), and Ember-Wing Cloak (-6 Orthstirr) as combat begins (all subsequent attacks and defenses benefit from Skyfire).
-[X] Use Identify Concept on the sword Thomas is holding (-3 Orthstirr)
-[X] Once we've used Hefty-Halter Chop (whether it works or not), use Orthstirr Enhanced x126 Banishing Rebuke adding 3 Odr (-150 Orthstirr, -3 Odr) to attempt to free him from whatever spirit has entered his body.
-[X] If the fight is still going after the exorcism make a total of two 60d6+5 Sharpenedx21 Lightning-Charged Flashfire Cleave attacks w/Puncture (-36 Orthstirr each), followed by twelve 12d6+5 Sharpened x5 Lightning-Charged Basic Attacks (-6 Orthstirr each), trying not to kill him unless necessary in all cases
-[X] Against his first attack use a 65d6+9 Reinforcedx17 Hefty-Halter Chop (-20 Orthstirr) to hopefully disarm him. Do this even before the Semi-Halting Vortex gets a chance to work.
-[X] Against the next three attacks use Contested Movement (again even before our Semi-Halting Vortex) with one use of Fight Of Our Life each (-3 Orthstirr, 15d6+5) and counterattack with Lightning-Charged combo attacks with Firebomb Strike + Shatter Wrist Trick w/Puncture (-14 Orthstirr each). If that fails to work we'll use a Shield from our Fylgja if possible (-1 Shield) and Focus Guard (-7 Orthstirr) or Sidestep (-2 Orthstirr) as appropriate if not.
-[X] After that, by default use our Semi-Halting Vortex to defend against everything. In response to anything without the ability to go through Perfects that gets through Semi-Halting Vortex use Halting Vortex (-4 Orthstirr) if possible and Focus Guard (-7 Orthstirr) or Sidestep (-2 Orthstirr) as appropriate if not, and if something somehow gets through that use up to three 60d6+9 Reinforcedx53 Sway defenses (-55 Orthstirr each), while if something looks like it ignore Perfects we'll just use a Quickdrawn Shield from our Fylgja (-1 Shield)
-[X] If, at any point, we drop below 100 Orthstirr stoke Virthing (+220 Orthstirr)
-[X] Tactics – So, he's clearly possessed, maybe by that weird sword. We're going to try and analyze the sword, ideally disarm him of it, and kick out the evil spirit. From there, if he's still fighting, we use Flashfire Cleaves, Contested Movement, and Shatter Wrist Trick + Firebomb Strike combos to deal with him in a straight fight, is the plan.
EDIT: Replaced counterattacks with Shatter-Wrist uses.