It's too late for a turnaround, but I've found a historical Empire magic item that would've been very good for Mathilde from The Empire 8e: the Ring of Volans.
Once per battle, the wearer can cast any battle magic spell from any of the eight Colour lores. That's an insane amount of versatility.
Is
the armour that Thyrus wears a different set of armour or is that art not used in the quest?
Immaculate vibes.
The Age of the Silver Savage. The Silver Age if you will.
The Empire 7e, the Grey Wand
This item would be quite good as something to purchase with CF, but unfortunately it's not available to us. The only Battle of Blood Keep I know of is in White Dwarf 148, and that had Karl-Franz fighting a combined force of dwarves and Wood Elves. (The Empire side had a grey wizard, which makes me further think that this is the Battle of Blood Keep mentioned in the item description.)