how many and where to put it.

Top right golem and smithy, top left smithy.

If you only want to use one (recommended) the 4th from the top in the second row on the right. You kind of need all of the loops at the top to be removed.

1. Use sacrifice on that alchemy
2. Lock the top left armoury
3. Lock the top right golem

https://preview.redd.it/ynn1hmpv7vhg1.png?width=1225&format=png&auto=webp&s=06d603ba41faa166e8c6fd0be61f4a196b5da5d4

• Case 2 won’t happen, because the algorithm tries to delete as many rooms as possible while avoiding the creation of islands.
• In your setup, the temple is trying to delete 4 rooms, and you currently have 2 treasure rooms, so it must delete at least 2 rooms in that section.
• If it aims to delete 3 rooms (meaning 1 treasure room gets deleted), there is only one valid path given those locks.
• If it aims to delete 2 rooms (meaning both treasure rooms get deleted), it can’t be image 2 either, because that configuration would only delete 1 room (the other deletion has nowhere to go).
• So, if you lock it this way, the odds strongly favor image 1:
  • either one of the armouries survives,
  • or the entire line gets erased.

if you have a sac room, just sac the bottom right armoury and lock top left smithy