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Non-elemental melee attack with wide range
Duergar is essentially Wryneck, but you can get it much earlier in the game. However, to unlock the final Karma that gives it the same reach as Wryneck, you'll need to defeat Boggarts, and Wryneck is a few rooms beyond that. I don't really see the point.
How to get it: Accumulate 30,000 Campaign Points in Dungeon Trial mode.
Slash elemental medium-short range linear attack
Collbrande charges forward, a bit like Fraxinus, but with a wider and shorter attack range. It's pretty neat, but nothing I couldn't live without.
How to get it: Accumulate 150,000 Campaign Points in Dungeon Trial mode.
Water elemental attack with very large area of effect
Kaladbolg is probably the best of all the Dungeon Trial Folks. It takes far too long to activate, but when it does, it showers a huge area around Ellen with a strong Water attack. It even extends upward to hit flying Folks like Impet. Plan carefully to avoid being hit, or inflict a status effect on the surrounding Folks to buy time, and you'll get a lot of use out of this one.
How to get it: Upload a 4500-point dungeon in Dungeon Trial mode.
Wind elemental attack that sweeps out a triangular area, can summon up to three at once
Quasarilli is a pretty great attack, although accumulating 15 Green Quartz to build up its final Karma can be a real pain. You can toss a couple of Quasarilli to damage anything that approaches while you use other Folks, or just hide in the center of the storm. It also lets you get the Faery Cloak before defeating Boobrie, so there's that.
How to get it: Download it for free from the Playstation store. This only applies to the North American region as far as I know - the European region gets two different Folks in place of Quasarilli.
Slash elemental medium-range roughly linear attack with sustained area effect at the end
Grab Bag leaps forward, slashing anything it hits along the way, then spits out a bunch of presents that do additional damage to anything they hit. It's great for tossing and letting it do its job while you attack with Ogma or Fraxinus.
How to get it: Complete the "Holy Night Visitor" DLC quest as Keats in Chapter 5. When you complete this quest, Grab Bag will be added to Ellen's bestiary regardless of how far into the story she is.