Eirika's Attack stat.

She was battling the Hard Mode Valter GHB, and this one had 26 Def (Moonbow +Lunar Brace = 20 damage).

Her weapon is basically 19 might, so I'm estimating 31 here without A skills or seals. That's 50 total, and Atk/Spd Solo brings that to 56. With weapon disadvantage, that falls to 45. So 45-26 = 19 damage at base.