How to deal with dancers in Aether Raids?

Dancers are normally easy. You have to build your team around being mostly Enemy Phase or something like cavalry Player Phase with a some Enemy Phase. What I mean by that is build in a way that allows a unit to tank multiple hits from a target(If they get refreshed by a dancer/singer) or to tank a single hit from multiple targets(People like to put different colours with the same range despite being on different tiles. Like Roy being next to L!Lucina). Either do that or make a unit like DC/Vantage Ares. Get him into combat on PP, get into Vantage range, and let him destroy your opponent on EP.

That's the nice thing about being able to select one of five teams and being able to preview your opponent. You can build a team to counter a more specific variety for those situations.

B!Lyn is heavily countered by dragons. Even if she doubles, if you're running something like SB Tiki/Nowi/M!Grima, B!Lyn isn't going to be doing much, especially when getting hit by Aether. This can be said for Rein too, but you need to be magically defensive, so those units might not be the best.

Veronica is a bit more difficult. Her main builds involve being a troll that can't be hit on PP. So you need someone to either tank both hits with minimal damage or hit her first. Odds are you do the former.

Edit: Forgot completely about Dancers themselves. You really only need to worry about their ability, which you seem to do. If you're able to get a dancer away from their allies, then do so. You'll have to be wary of Wings of Mercy, but if you can get a Dancer to hit you on EP, you're set.

I Just bait them out so they get closer. Even with B!Lyn or Veronica, I still bait them cause I rather not get one of my units get surrounded by the enemy team( since rather than YOU getting closer to them, They'll have to get closer to you which is easier for me since my playstyle in arena can be put to use if they initiate)

One of the best ways to counter Vero or any healer is to cause pain to units. Preferably aoe pain. They always use their turn to heal.

Also, cavalry ranged units work great. It's never a bad idea to buff a unit and go in range for a kill and then repo back completely out of their range. If you use Savage blow or pain+, they'll use their turn to heal and then dance to get in your range which is good for you. If it's Lyn, you can try to draw her out of range of the dancer with a bulky or fast unit, or let her be the one you take out first due to her low bulk.

Or, just find an opening to bait a unit out that cannot be danced once baited. It just depends on the setup. I really recommend doing the math in matchups and to consider the enemy skills to make sure you'll survive even if you do get danced.

My favorite strat is to cause mass pain and repo and swap out. It all depends on your team choice though. Dancers can also counter dancers.

Kill everyone around them.

0. If you're lucky:
Bait the dancer, dancer suicides into you. Rejoice!

1. Against an average team:
Clear the correct rubbles, then snipe down dancer in one hit and steer clear.
An average team often overlook a small flaw in their piled up debris.

2. Against a good team where dancer is well protected and impossible to snipe:

Dancers have a range of 2.
This limits the number of units which she can support, therefore most of the time she is intended to refresh only up to 2 units but not all 3 (on the first turn at least).
2 units can cover only 2 weapon types, so bait using a high def/res unit which isn't weak against either.

Option A) Bait the attacker who is intended to get refreshed.
Example: Healer attacks Myrrh. Myrrh survive, Azura refreshes Healer who strikes again.
Myrrh still survives. One down!

There is a likelihood that the attacker will move on to strike a different unit after getting refreshed, but maps rarely have that much moving allowance - nobody can resist planting those adorable statues and gardens everywhere :D

Option B) Snipe the attacker who is intended to get refreshed, then steer clear.

Units needed to snipe safely:
Sniper: Ranged cavalry + Reposition
Dancer: Dance
Remaining 2 units: Minimum 1 more reposition, preferably 2 or 1 reposition + 1 draw back

3. Against an obscene team where dancer is protected and within range of Guidance, Smite or other unpredictable skills:

Uh, good luck...? Not that I have encountered one.
Consider taking a screenshot and copying their defense layout, at least you gain something out of it! \(◦'⌣'◦)/

Additional general tips :

- Prepare glass cannon flyers to OHKO.
Dancers are often kept out of reach, but sometimes the defenders overlook the fact that a hole in the ground means nothing to flyers. Ideally paired with a flying dancer.

- Keep calm, do not get impulsive.
It is okay to waste 4 out of 7 turns deactivating traps and pulling to safety before you finally get to snipe the dancer.

- You can force-activate traps and still move.
Simply reposition a unit right onto the trap panel. Be wary of gravity traps though.