Fix mistake in Hyrule Castle description; add stub for guaranteed ene…

…my drops (guaranteed items missing from the spreadsheet)

content/dungeons/hyrule-castle.md

@@ -10,7 +10,7 @@ background: "/img/backgrounds/hyrule-castle.png"
 [Octavo](/bosses/octavo) is the boss of Hyrule Castle.
 The encounter is skipped if a player is Octavo.
 
-Hyrule Castle has 4 floors which are done in succession without any checkpoint between them.
+Hyrule Castle has 3 floors. Defeating the miniboss on a floor will make it remain defeated and the door unlocked even if the player later gets a game over.
 
 You can access Hyrule Castle early through [Barrier Skip](/sequence-breaks/barrier-skip/).
 

content/overworld/mapping-pois.md

@@ -201,3 +201,14 @@ Note: both of the beach POIs can be mirrored.
 #### Both beach keys on the map
 
 ![](/img/mapping/beach_07_08_example.png)
+
+## Guaranteed Enemy Drops
+
+**TODO: Screenshots, better descriptions**
+
+An Iron Knuckle Captain in the Desert is guaranteed to drop a Ring of Piercing. <!-- desert_3 -->
+
+A Red Chest Mimic in the Desert is guaranteed to drop a Freeze Scroll. <!-- desert_10 -->
+
+A Red Chest Mimic on the Beach (in a poison tile) is guaranteed to drop a Need Scroll. <!-- beach_14 -->
+