For Legendary 2nd trial, I'd suggest pumping up your ranged physical DPS. I only had +2 fully trained Ares Kiera MW and Vincent Kratos Dragoon when I beat it. The rest are 5 star fully trained +1 (Zeus BK Victoria, Hera Teresa AB) and +2 lv 25 Invoker Isabella. I used a 4.8k ally Sharpshooter Kane friend. Focus all your attacks on the assassins, mages and archers. I let my Victoria tank Aaria and luckily my Vincent kept delaying Aaria with his passive stun. You really need someone to stun Aaria without using a skill. Even delaying her for 2-3 turns helps a lot. It should be easier now as there are already a lot of 5.5k+ attack Dragoons and sharpshooters out there. Also, all my equipments were +9 to +12 on all characters.I managed to clear the Aaria event except Normal - Act 3 - 3rd Trial (Clear without 4☆ & above) and Legendary - 2nd Trial (Clear without using skills) and 3rd Trial. I have some questions to ask.
How difficult is it to clear Normal - Act 3 - 3rd Trial with maxed training 3☆ units? (I can probably make the party in the few days left) What units are recommended?
And the hard part - Legendary - 2nd trial... (I've read the Legendary Aaria thread)
I find this actually impossible to do since I do not have enough damage (because if I don't use skills to clear all the ranged mobs they kill off my most squishy unit even with 4☆ DEF up eggs with a Paladin beside her - Kiera; then proceed on to my next unit) and I tried out living Aaria slowly but surely killing her but she suddenly one shots me. Any cheese tactics for this?
For normal act 3 trial 3, just fully train a similar setup with max level and transfer your main equipment to them. I used a Vincent, Teresa, Kristof, Victoria (yeah I had a lot of 3* duplicates) and Cybella and that should do the trick.. I find thief class pretty useless in these trials as they are too squishy for anything. Hopefully they are getting buffed soon.