Hi, let me give u a tip for clearing Expert. Use at least 2 light and 1 dark or vice versa. The lone element leave it as back up. You can also make use your soul to have a dark/light main weapon.
Get a Light or Dark Eidolon for support(Apo and Phonix lvl 40 is okay)Focus your attacks first on enemies with 2 circle rage gauges, this is to avoid as much nasty dmg as possible. Use attk buffs before every attack and use all your dps/aoe abilities before attacking. For debuffs like Scorched and Drowining, put it on the ones with 3 circle rage gauges.
This technique will get you thru first round but will easily make you vulnerable during the 2nd round so get as defensive as much as possible on 2nd Round when the rage gauge of the monsters are full(Regen and -35% dmg taken by Roland is preffered). Still, focus your attacks on monsters with 2 circle rage gauges.
By the time the 2nd round is ending or the 3rd round is starting, most of your Burst should be full and your skills cooled down.
If it doesnt work the way I told you and you ended up using bursts becoz of emergency, You can start from center monster and put debuffs like scorched on top monster.
Good use of buffs to kill monsters before they go TITANIA is key to these event.
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No u will only get 10% ATK/HP up becoz the only eid effect you will get during battle is from your main eid equipped.