Lucina, Brave Princess
"Our bond... gives me strength!"
This quote from Brave Lucina say's a lot about her functionality actually. She provides offensive support to other units when she's within 2 spaces of them, and in return their ability to deal with Lucina's threats allows Lucina to fight against units that perfectly get countered by her. That isn't to say Lucina can't do a lot on her own though. She's still a pretty amazing and speedy lancer.
Level 40 Stats:
HP: 38/41/44
Ardent Sacrifice isn't enough actually, and also it's very risky during the Arena where Repositioning skills are in constant use and need. 30% of 38, 41, and 46 is always more than 10 as well.
I think you got one of the worst banes imaginable, but it's not a big deal if you're doing ultimate support Lucina. Also this is off the books, but you could try Warding Breath + QR 3 + Berkut's Lance+ + Close Defense 3 seal as a joke, a trap, and also perhaps to counter some Red Dragons. Don't do an