Endgame Beserker

This team works roughly 80% of the time depending on your units on the map and their skills.

Keep this in mind:
• Your key attacking players are Linde (or whatever extremely powerful mage you need) and Marth. Marth is a must. If you don't have Marth, use a speed and attack heavy unit with Luna or any upgrade of Night Sky.
• Marth is usually placed behind Linde (or whatever mage you picked) on the first turn to attack the rival mage. The speed boost can save you.
• Marth's Escape Route WILL save you a lot. The tank unit can help by bringing Marth closer to Veronica or any major green units.
• With a +Spd Marth and Fortify Res 3 currently buffing him; he actually WILL survive an attack from Veronica. Even a -Res Marth will survive, as I use a +Spd/-Res Marth
• Azura or any dancer/singer works. However, if you are doing THIS team, I highly reccomend Wings of Mercy. This is a beserker team, therefore your team will reach half and below health quickly.
• I personally use Chrom as a tanking unit or - sadly - as bait who can land a few hits. I choose him because of Falchion, therefore giving him a bonus. Use someone who tanks the units to your preference here.

I'll give you my team reference with boons/banes, and skills:
• Marth: +Spd/-Res. Uses Falchion, Pivot, Luna, Escape Route 3, and Spur Spd 3. No A passive or S passive as of writing this.
• Linde: +Spd/-HP. Uses Aura, Adrent Sacrifice, Glacies, Spd +3, Vantage 2 (for now. Desperation can work, but it depends on preference), Fortify Res 3. No S passive as of writing this.
• Azura: True neutral. Uses Sapphire Lance+, Sing, Astra, Spd +3, Wings of Mercy 3, Fortify Res 3. HP +3 for S passive.
• Chrom: +Def/-Spd. Uses Falchion, Pivot, Aether, Defiant Def 3, Vantage 3, Spur Def 3. No S passives as of writing this.

TL;DL: Marth and Linde (or any heavy damage & speed orientated sword user and mage) are your main units as they double almost everyone and kill them, Chrom is a tank that can be replaced by your preference, and Azura is your major dancer/support that is needed to survive. Skills are the key issues with this, but this team's main skills aren't a hassle since they come from their own skill sets... with minor SI. You are very likely to be left with two or three units after this, but you'll win most of the time.

Azura

Chrom

Marth

Linde