The game is too hard for f2p who like to do solo achievement. Its not enterily impossible (with lv 90 hero) but you need to equip with true equip and relic from side quest. But the process would take too long that player would just quit playing. The main problem with this stage was after the boss middle bar rage that burn all of your mana. With only lv 90 and the lv 70 baggage MC, you had to have equip that quickly add all team mana (especially for your shield hero that negate dmg and the healer). Now it get easier with new hero from cross over and their equip, but that too take too long. The dev should make easier just for the mc awakening while this type of boss should be his ascending stage. I mean what kind of game that has its MC lv lower than their guess MC
"f2p" is basically just doing the best with what you are given. Then being stingy with your crystals. not pulling unless you have enough for a pity which 1500 for a pity is bit much. i dont even thnk you can farm 1500 in a month. Its impossible