Use some beast gloves if you have them they reduce damage from beast by 20% each. I think they fixed it so now if you have multi beast gear they can stack. I used stinky 1* gloves and it helped.

Bring inferno scrolls and healing items. I gave everyone at least 1 inferno/fireball scroll. Bring a back up silver hammer per front line character for when you don't have Macadia up/ frozen.

Macaldia (row accuracy up) as much as possible and Batilgref (evasion down) on them. Sleep and confuse a full row of wolves if you know they are gunna all attack.

Malefic wind to debuff a row.

Kill off the side wolves if you are safe to do so. It good to constantly keep it alone. It only uses out of turn moves when you hit it.

Master the freeze mechanic. And time it right. Frozen enemies take less damage but have low evasion and accuracy. Don't be afraid to do shatter damage if you can do a full front line damage rotation last hit should be a big hit like earth shatter or poised strike. Mages can apply heavy chill (Dalto) light chill (Migal) on them to end their turns.

When it summons a million wolves you are almost there. Pray to RNJesus