Warning if you kill Berserker in Rare mushroom (step 90) too soon battle ends before you get to complete kill 50 mechanical mission

Yes, I encountered this too, I added a note in Step 90 to help warn against this. Thank you!

In the Event Completed block at the end of the walkthough, you didn't change the text and link from the previous Da Vinci Summer Event

Thanks for the catch! Should be fixed!

the event completed section here mentions da vinci's event instead of setanta's

Really sorry about that! Thanks a ton for the catch, should be updated.

The link to the quick farming guide at the bottom goes to the previous events page

Oh thanks for the catch! Fixes should be live in a few minutes.

If you click on the quest name (or here: https://grandorder.gamepress.gg/c/quests/olga-marie-quest-2-2-3 ), you can find a more detailed description of the mechanics of the quest. This quest has quite a few details, so this page sort of works as a stand-in guide.

TL;DR, certain enemies in the battle give you "Presidential Badges", which you can spend on the special Mystic Code skills. These are kept between waves, so one of the goals would be to try to kill as many enemies per wave as possible to get as many Presidential Badges, and to stock them up for the final 10th wave. Once you're up against the final boss, you can spend them all to buff up the damage dealer to increase your damage output.

Many of these -in particular the older ones- result in a 404 error when clicking on the link. (It also would be convenient if it was easy to reach a Servant’s interlude from thier Unit Page)