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Walkthrough

Walkthrough for the side quest Wine Wars: The Deus in the Machina from The Witcher 3's second DLC expansion, Blood and Wine

You can pick up this level 42 quest by completing certain objectives for two other quests:

Wine Wars: Coronata - find "Orders on Elegant Stationery" at the objective marker (Hidden Treasure) northeast of the Coronata vineyard.
Wine Wars: Vermentino - find "Letter on Elegant Stationery" at the objective maker (Hidden Treasure) north of Corvo Blanco. Here you also find the "Heavy brass key" that opens the warehouse.

On reading the second of the two the quest begins. You can visit the Ducal Clerk at Plegmund's Bridge to suggest possible sabotage at both vineyards but there is no reward for doing so.

When you arrive at the objective marker, find the door to a warehouse. It is located downhill from the buildings, similar to how the wine cellar at Corvo Blanco is situated.

There is one archespore to deal with (Cursed oil, Aard and/or Igni). After it is down use witcher senses to search the area.

If either Liam or Matilda already owns Belgaard, or you failed to mention sabotage when turning in the Vermentino/Coronata quests, then you find a corpse containing "Fragment of a Letter". On reading it you find instructions about cleaning the warehouse. No names are mentioned so the opportunity to uncover the identity of the vineyard saboteur is lost. The quest ends and you receive no XP.

Otherwise locate a pair of wooden trays. Loot them for "Stocktaking Report" and some other items. On reading the report you learn that Count Crespi is behind the archespore sabotage.

The quest updates, instructing you to notify Liam and Matilda of your findings. Also examine the archespore bulbs in the nearby wall nooks. Then burn them with Igni to gain 100 XP.

Going back to Plegmund's Bridge and reporting your findings ends these quests, regardless of how many objectives you have completed for the first two: