In Chapter 848 a candidate said "Tell him I'm willing to use everything we have to help him reach tier 6" so I asume he also needed some materials from the others to reach tier 6.
"Nothing. There isn't anything we can do right now other than try to get as many artefacts as we can. There isn't a way for us to get strong in a short period of time so we can only hope that Nostic reaches tier 6 quickly. He's already been in there for a while now so it should end soon." Rank 3, Lynnri sighed as they were running out of options.