What to do with Marthcina?

Since I don't have Lucina, I made mine into an amazing pseudo-healer. With Falchion's renewal effect, Reciprocal Aid, wings of mercy and hone attack she's a great partner for bladetome users and glass cannons. Plus she's pulled me through 8/10 of the maps on the hardest chain challenge (11&12 lunatic) - really close to actually beating it!

I can share my build with you. I went for a semi-healer/attacker build.

A: Darting Blow 3
B: Renewal 3 (2 works great aswell)
C: Breath of life 2
Sp: Moonbow
Assist: Reciprocal aid

This combined with falcion Masked marth will gain 20 health every 3 turns making it really easy to use reciprocal aid on damaged allies and gaining back the lost health within 3 turns.

Darting Blow is to take advantage of masked marths already high speed and decent attack to still be usefull when offense is needed.

The C-skill can also be used to buff or debuff, that depends on the needs of the team. I chose Breath of Life so M. marth can still act as an semi-healer when attacking. Any Threaten/Hone can work great aswell.

This build works extremely well in Trial runs and chain challenges. If used right it gives your team the much needed healer without taking up a (non-combat) slot in the party. It has worked wonders for me on many different runs.

Hope this helps!

I agree with above posters. HealCina is quite likely the best healer in the game. With just Renewal 2 and Falchion, she is very resilient. In Tempest Trial runs, for instance, she heals for 20 at the start of each new battle. So you can heal somebody at the end of a fight and regain 20 hp at the start of the next one right away. Amazing.

I slapped Darting Blow on her because of lack of Swift Sparrow inheritance, and it works just fine. She doubles almost anything you would want to double.

You can go all out healer and give her Breath of Life+Breath of Life seal to heal another 10HP to adjacent allies when attacking. I prefer a Hone skill and HP+3, to make sure you almost always fully restore an ally when Lucina is at full health.