Morwen extracts as much of the dark magic as she can. It had been an exceptionally rich vein but that doesn't translate to greater amounts of power available to her as it fades away faster than expected. Within the first week the necrotic power is effectively gone and no extra effort is needed to purify the area beyond recovering the remains of the victims and performing their last rites properly.
Over the next few weeks several more of the troops come down with ghoul fever but no one dies due to Darfilla's treatments.
In that time the healthier people inspect the barrows led by Morwen as she locates the magical goods she detected.
Among them she recovers:
28 scrolls, 6 of which bear religious inscriptions, 8 are protective wards and the rest are of arcane nature.
17 potions, 2 are the same as 2 of the unidentified potions from the ogres. The Alchemists will be busy.
a sword, clearly of Ravenmake bearing an aura of transmutation.
a suit of (human sized) archaic heavy armor, its adornments and symbols of protection have been defaced.