Me and my buddy tried to do it last night for about 2 hours and we never uncovered any of the 3 colored fogs. noticed a lot of these walk throughs and videos are SOLO so we started the fight and my buddy died instantly after he died i uncovered the orange fog. didnt find another one in next phase and boss wiped, i think theres a better chance to do this solo and it does take time there is a cycle i have yet to find