The despair whirlwind of "Oh God one of my best units is abducted" to "At least I can go recruit the 8 foot tall battle mommy" to "oh that's a level 40 endgame fight"....
like i mentioned for it i managed with a team of lv29s/30s and one of them was josef, so kind of practically less than 29s and 30s on average lol. the weapons you get in the shop for it make a pretty big difference, i think it'd have been doable around an average of maybe lv26 or so but i'd already done the grinding to 30 at the one grind point in the chapter 3 area when i gave it a go
if you do a good evasion team it's very likely doable as soon as you get there too, a mostly high evasion team + sandstorm staff just seems like autowin against every team that doesn't have truestrikes. the only catch is you have to sacrifice evasion on the sandstorm user for high initiative instead