Then it's a lack of AFF and level.Sr mate but that problem can only be solved in grinding a long time and do AFF map/farm Phalanx 2(which STILL require you have at least 2 CCed Witch, preferably 3), which is both troublesome since the next daily is DC.I think your best course of action should be just farm the 3sta one until you're ready to try again.And again, the more tough enemy on this event are probably only Armor and Shadow(they hit hard and near-invulnerable to magic, so I recommend you use only 1 mage, you should only need 1 mage to blaze through storyline mission until Fiery Oasis anyway).Witch is a priority as well as tank and healer, if you highest aim is for the 5sta map, after you lvl your Helaers (at least 2 CCed , to be safe for storyline mission 3)you should priority a Bandit (Mortimer is better since that Dark Knight hit hard, if you use Eunice he may very well 1-hit you even if your HP is 1800+) or a Valkyrie( since they are key in the current Subjugation).