I need to do the Magicite Missions for Rank 5 myself. However from past mission experience, making a big party is typically a pain in the @ss. It is usually easier to get one High level from your LS or elsewhwere with Sneak/Invis help you through these.
I will more than help and join if we have a couple High levels helping, but a PT of 6 lvl 30's ish players wll be a disaster, from my experience.
Rank: 10 RNG