My first response to this post was: this campaign sounds cool!
My second was: if even a low-level PC can get brought back from the dead --twice!-- how applicable is the word 'fragile'?
It was a very cool campaign, indeed. I'm secretly hoping Jeff gets over his recent Traveler flirtation and back to D&D so Fred can delve again. But don't tell him that.
With regard to the resurrections, Fred was an exception. I believe he was the only one who came back twice, and it was mainly due to his great wealth and largess to the church that it was possible. Long story, but early in the campaign, Fred nicked a very valuable amulet from the dungeon without the rest of the party knowing. He cashed it in and was smart with the money.
I believe two others - Bishop Aethelred, a member of the clergy with a less than stringent belief system, and Lankii, a necromantic elf of dubious reputation - survived the entire campaign without dying once. I believe every other player in the campaign (and there were about 8 of us regularly rotating in) had a pc that "didn't make it" at one point or another.
The most tragic death, to Fred at least, was the loss of Goma the Ugly. Goma was a trouble maker. Probably more trouble than he was worth. When Goma tried to infiltrate a Cancer Cult, the rest of the party decided to ransack the cult's treasury while they were distracted with Goma's initiation. Goma freaked out midway through the initiation (trust me, you would have, too) and started yelling for help as he tried to cut his way free from the cultists. The rest of the party wanted to bug, but Fred insisted on saving Goma. We caught them by surprise and slew them to a man. (Or maybe "man" - I'm still not entirely sure they were human.)
Anyway, Fred had Goma on the hook for "a solid" and if Fred knew how to do anything, it was to use a debt to him to his advantage. Unfortunately, before Fred could ever cash in on Goma's gratitude, Goma was immolated by a dragon. Fred had a knack for not being in the same place at the same time as the dragon. A knack he did not share for vampires. Fred did, however, eventually take part in stealing the dragon's hoard. He didn't even insist on taking Goma's share.