Memory of the Witness (post raid key)

Hi all,

There seems to be a lack of information around this key so I thought I could compile some answers from various people.

1. does the full raid need to be completed to obtain the key (has anyone got it only from a boss kill)

2. does it drop on every character once a week (has anyone got it more than once on the same account this week)

3. do the people who have only obtained spoils from the key unlocked any weapons from the raid?

Feel free to add more questions!

Thanks in advance!