Howdy!

Coincidentally, I had begun working on my own Compendia Module to handle at least some of these effects for a Campaign I participate in - and at the time - there wasn't an existing Compendium to cover Relics & their Gifts - as it would appear, your initial commit happened just a day after mine did here: https://github.com/jasonmc1993/pf2e-relics - but you'd probably been working on this for awhile - whereas I had just started with the effects pertinent to my campaign.

After noticing this with my GM - I went through a quick review of the effects I had worked on, and noted that Gift: Shroud of the Afterlife from the Death Domain is missing a couple of effects as covered here: https://2e.aonprd.com/Relics.aspx?ID=21

Namely, you appear to be missing the Poison Resistance and the +1 Status Bonus to Saves with the death effects, diseases effects that would make you paralyzed, poisoned and sleep.

Poison Resistance: {"key":"Resistance","type":"poison","value":"max(1,floor(@actor.level/2))"}
Flat Modifier to Saves:

{
  "key": "FlatModifier",
  "label": "Shroud of the Afterlife",
  "selector": "saving-throw",
  "value": 1,
  "type": "status",
  "predicate": [
    {
      "or": [
        "death",
        "disease",
        "effect:poison",
        "effect:paralyzed",
        "effect:sleep"
      ]
    }
  ]
}

Thanks for your hard work - and for beating me to the punch!

I am unsure if anything actually needs to be updated other than the module.json, but Foundry shows this module as incompatible right now.