Tbh I don't think any of our top players really care about dread guard drops or essences, all we're really concerned about is the necklace
On the topic of guilds involved, my instinct would be that rolls on the necklace reflect numbers contributed. For instance, if we supply half the people (which we have so far), and midian supplies the other bar 1 (let's say from X) it would be unfair for X to get the same chance as Midian and NC who contributed far more.
This is just my feeling about it, suspect Konx and the other GMs will work it out