I ran into an issue running the relic for the first time with my Titan last week. While in the portal, a teammate would take out 1 of the enemies with a rocket, leaving less work for me...which in theory is good except it took forever to get the relic super charged and our screens were black by the time I was finally able to cleanse. We still ended up clearing the oracles in time, but is there some secret to charging that relic ability quicker? And is it best to just let the relic holder take out all enemies in the portal?