Crash report: crash-2021-10-13_06.10.15-server.txt
Data Pack: snavesutit.fishpond.zip
Origins version: 1.1.1 for 1.17.1

Caused by using the origins:amount damage condition with the invulnerability power type.

{
  "type": "origins:invulnerability",
  "damage_condition": {
    "type": "origins:amount",
    "comparison": "==",
    "compare_to": 4
  }
}

The invulnerability power type does not support the amount condition.
If you want to disable damage based on the amount taken, you should use modify_damage_taken.
See the wiki page on the invulnerability power:
https://origins.readthedocs.io/en/latest/power_types/invulnerability/