Nevarra's burial practices are...unique in Thedas.

[And this is one instance where Fingon is siding firmly with this world's mainstream opinion, because necromancy, this is madness.]

They invite spirits to inhabit the bodies of their dead, and bury them together in family crypts. We were invited to tour the great crypt in Nevarra City, but someone unfriendly to the Inquisition enchanted the corpses inside to kill everyone in the party.

A win-win situation for the one behind the plot. Either we all died, or the Nevarrans were offended by what we had to do to the corpses of their kin.