The bosses have way to much health and way to long of a mechanic phase. If you want to have a boss with a lot of health give us a short mechanic phase (spire final boss) If you want to have a longer mechanic phase give us a boss with lees health (cital) If you have both it becomes painful to solo it. Yes it’s doable but it’s gonna take forever. Ghost of the deep final boss is the worst offender. Solo the mechanic phase takes eons, the shield needs to be broken, and damage phase is short ensuring you do little damage ensuring you need to do the mechanic phase more. It is way to annoying. The bosses need a health scaler based on fireteam size