Secret Sorcery Lab in Bloodstained: Ritual of the Night is a small area deep under the castle. There’s not a ton to do here — you’re mostly just passing through on the way to another area.
Below, we’ve included a complete map of Secret Sorcery Lab with a few notes about the area.
Secret Sorcery Lab map
Once you get the Aqua Stream Shard and can push deeper into Forbidden Underground Waterway, you’ll be able to access Secret Sorcery Lab. This area serves mostly as a bridge to get you to Inferno Cave. While you’re here, you’ll fight some tough new enemies. You’ll also have to avoid some exciting new traps that will require you to use the Shards you’ve picked up so far.
There is a tough boss fight that will get you a good defensive Shard before you can continue through to Inferno Cave.