One Word Prompt #63 - Ninja Clan Hold (Patreon)

Hey all!

I've got another whopper today: the ninja clan hold. This beast of a map from Tom Cartos includes 27 interesting locations hidden below a major city. Help me fill the rooms by suggesting a single word down in the comments below. Using your word, I'll detail the room.

Typical rules apply:

1) One word per patron

2) Keep it clean

3) No proper nouns

4) Nothing too anachronistic

I look forward to your suggestions!