I think the others are right.
The crystal/energy shards left over from Guthix won't have any effect (let alone the side effects of exposure to Seren)
Now that's not to say there would be 0 after effects from exposure to that kind of raw crystal for an extended period of time.
Is it possible that the crystal shards ended up being the equivalent of divine low-dose uranium:
short term exposure isn't an issue, but those who survived the whole battle AND didn't have the "World Guardian" aspect are destined to die from the equivalents to radiation exposure ...
sure could happen
24-Mar-2017 18:16:36