>>723018229
>Is that supposed to be difficult?
I mean yeah. It's pretty demanding for a Lyn!Ivy. Where is all that damage supposed to come from? She averages 29 mag at IL35, which is already a very high internal level. Even if you tonic'd up and had a Bolganone with 20 might (and a hit engrave of course), that's still only 51 attack. Even if you hexed Lumera, you're still 2 short.
So what, glue Alear to her for the +3? Do a magic rally with magic-type Byleth? Maybe you have a skill that adds magic damage, or you gave her a spirit dust at some point. It's not impossible but you can see it's rather demanding, when it's easier to just crit her out with an Ike user or double with a roided up physical Roy user.
Different characters are more suited for different jobs.