The Clockwork Castellan associated with Chapter 10 of the main story in the Resident Evil 4 Remake can be found near the Merchant in the sewer network that you reach after escaping the Depths under the castle. We’ll show you exactly how to find it on this page.
Location of the Clockwork Castellan in the Sewers - Chapter 10 Resident Evil 4 Remake
To reach the sewers section of the castle where you can find the Clockwork Castellan in Chapter 10, you first need to escape the Depths, which Leon was cast into after finding Ashley with Ramon Salazar. The Depths aren’t too dangerous but they do contain a number of Novistador monsters in the waters, so you’ll need to be careful to shoot them before they ambush you.
After climbing the ladder out of the Depths into the sewers, it’s a fairly straightforward path to the Merchant, since there’s only one way to go. You need to look for the purple light which marks the location of the Merchant, then look at the sewer grate directly opposite to hear the Clockwork Castellan. You’ll see it near the top of the grate, as shown below. All you need to do is shoot it to “collect” it.
If you’re still having trouble finding the Castellan, see the video below for more help.