Just a PSA if anyone else was confused by the wording and thought it meant mori everyone, you just need to get a 4k.
Adding on - DCs don't count against you
Usually, when a Mori is involved it is written like "by your own hands". At least on the PTB there was a Mission to use a Mori, written like that (or similar).
I'm so glad you can still do the mission if someone DCs. Would've taken forever otherwise.
@Aven_Fallen I am aware of that, but since sacrifice was not mentioned I assumed it meant using Mori, Rancor, Mike, or Devour Hope.
I was pleasantly surprised when I got it from a 4k. Glad I left the challenge selected!