lufia2ac: document changes from the vanilla game

worlds/lufia2ac/docs/en_Lufia II Ancient Cave.md

@@ -13,9 +13,8 @@ the end of the Ancient Cave you get to fight the Royal Jelly... if you make it t
 Jelly fight as it kills itself after giving you three rounds to try and kill it (or manage to vanquish your own party, 
 whichever one you can manage).
 
-The Randomizer allows you to set four different goals (Kill the Boss, Iris Treasure Hunt, Treasure hunt + Boss, Reach 
-final floor), and modify the game in several other ways (define where the last floor is, start with providence, choose
-custom levels/evolution stages for your capsule monsters, etc.). 
+The Randomizer allows you to set different goals and modify the game in several other ways
+([see below](#changes-from-the-vanilla-game)). 
 
 ## What items and locations get shuffled?
 
@@ -34,3 +33,41 @@ Items belonging to other worlds are represented by an AP icon and are called AP
 ## When the player receives an item, what happens?
 
 Your Party Leader will hold up the item they received when not in a fight or in a menu. 
+
+## Changes from the vanilla game
+
+###### Customization options:
+
+- Choose a goal for your world. Possible goals are: 1) Reach the final floor; 2) Defeat the boss on the final floor; 3)
+  Retrieve a (customizable) number of iris treasures from the cave; 4) Retrieve the iris treasures *and* defeat the boss
+- You can also randomize the goal; The blue-haired NPC in front of the cafe can tell you about the selected objective
+- Customize (or randomize) the chances of encountering blue chests, healing tiles, iris treasures, etc.
+- Customize (or randomize) your starting party members and/or party level
+- Customize (or randomize) your starting capsule monster and/or capsule monster level as well as form
+- Customize (or randomize) the initial and/or final floor numbers
+- Customize (or randomize) the boss that resides on the final floor
+- Customize start inventory, i.e., begin every run with certain items or spells of your choice
+- Option to shuffle your party members and/or capsule monsters into the multiworld, meaning that someone will have to
+  find them in order to unlock them for you to use
+
+###### Quality of life:
+
+- Various streamlining tweaks (removed cutscenes, dialogue, transitions)
+- Always start with Providence already in your inventory. (It is no longer obtained from red chests)
+- (optional) Run button that allows you to move at faster than normal speed
+
+###### Quality of death:
+
+- Blue chest items that you received from the multiworld are kept, even if your party dies. (I.e., you do not need to
+  use Providence to make them permanent)
+- Similarly, but in the opposite direction: All location checks you make are immediately sent out to the multiworld and
+  don't require Providence for persistence.
+- (optional) Death link support. (I.e., if your party is defeated, everyone else participating in death link also dies)
+
+###### Bug fixes:
+
+- Vanilla game bugs that could result in softlocks or save file corruption have been fixed
+- (optional) Bugfix for the algorithm that determines the item pool for red chest gear. Enabling this allows the cave to
+  generate shields, headgear, rings, and jewels in red chests even after floor B9
+- (optional) Bugfix for the outlandish cravings of capsule monsters in the US version. Enabling this makes feeding work
+  like in the JP and EU versions of the game, resulting in more reasonable cravings