How to defeat Abyss Worm?

[Stormtrooper]

Hi,
I'm currentyl stuck at the Abyss Worm quest in chapter 8. I only play on normal difficulty, but don't stand a chance. These damn worms keep spamming their Earth Shaker, which makes the fight basically impossible. My party is around level 80 with ~8000 hp each, but the worms use Earath shaker 8 times in a row with 2000 damafe per use. I tried starting the fight with full CP so I could use S-Craft immediately, but couldn't deal enough damage to kill one of these. I have Action 3 or 4 equipped on all party members to boost speed, but that didn't help either. I'm really at a loss how to defeat these anooying pests, so I'd be happy if you have any advice for me.

[Berahlen]

Equip information quartz. Read the enemy description. There's a reason you're getting chain nuked by the whole room and it's entirely preventable.

There's a reason the game gives you Heaven's Eye for free almost as soon as the game starts.

[Mizufluffy]

Hint:
Those enemies use their Earth Shaker when they have lost HP.
Answer:
Kill them one by one with single target attacks so that only one of them does Earth Shaker.

[Dr. Rudolf von Richten]

Originally posted by Mizufluffy:

Hint:
Those enemies use their Earth Shaker when they have lost HP.
Answer:
Kill them one by one with single target attacks so that only one of them does Earth Shaker.

This.

Either use Joshua (Flicker) and Agate (Spiral Edge) to delay the one you're going after if you want to take them out one by one, or use Joshua (Evil Eye) and Zin (Thunder God Kick) to kill a small group of them; Thunder God Kick is broken and deals exponentially more damage the more targets you hit.

In either case, put Emerald Talisman (Damage becomes Wind Based) on both of them, and use Schera as an attack caster (Air Strike for single target with J & A, Aerial for multi target with J & Z) and Estelle as a Support caster (Clock Up Ex, Tear etc, Earth Guard/Wall.