Content is considered missable if, once the player has progressed far enough through the game, the content can no longer be accessed. Examples include chests, quests, encyclopaedia entries, skills and items.
Items that are finite in number, such as the Tectonic Sword, are considered limited.
Note that the large amount of content that becomes missable once the player passes the point of no return in the current chapter is not listed unless that content continues to be inaccessible in the next chapter. Also content that is limited, but only after a certain point in the game, counts as missable content and limited items.
The Tunics worn by Mardek and Deugan are unique items. They are normally lost when moving from MARDEK Chapter 1: A Fallen Star to MARDEK Chapter 2: A New Hero, but can be retained if they are stored in the Save Crystal item storage while completing the chapter.
Before talking with Gope
Item: Gope will give the player a ★ Trilobite Key IV, but only if he is spared in the Gem Mine. Note, this key can be obtained in MARDEK Chapter 3: Keystones, but content in MARDEK Chapter 2: A New Hero will be missed without getting the key at the first opportunity.
Before defeating the Locksmith
Before entering Moric's Battleship
Chests: Moric's Battleship is only accessible in MARDEK Chapter 2: A New Hero. The 10 chests here cannot be reached in MARDEK Chapter 3: Keystones.
Before completing MARDEK Chapter 2: A New Hero
Chests: Two chests are located in the right-hand path of the Gem Mine, which is blocked in MARDEK Chapter 3: Keystones.
Before fourth use of a Warport Ticket
Item: The ★ Warport Ticket may be retained only if the player defeats a Security Demon. The demon can be fought only by failing the security checks in the Warport. It has a 100% drop of the ★ Gold Warport Pass. If the gold pass is obtained by buying five normal passes, the player loses their current normal pass, and cannot purchase another one.
Before placing the Warding Stone
Bestiary entry: The Sekil can only be encountered in the Sun Temple. Random encounters stop happening once the Warding Stone is placed.
Bestiary entry: The Posh Gruul can only be encountered in the Sun Temple. Random encounters stop happening once the Warding Stone is placed.
Item: Moonstones can only be obtained by random drop from Antares and Moonstones (the latter being the monster, not the item). Both monsters are only encountered in the Sun Temple. Random encounters stop happening once the Warding Stone is placed. If you plan to get a certain number of Moonstones before continuing, bear in mind that four are required to make the Silver Mirror in MARDEK Chapter 3: Keystones.
Greataxe: Only four Greataxes exist in the game. Two are found in the catacombs, as drops (50%) from the two Zombie Warrior minibosses. One more can be looted from the Zombie Warrior in the arena. The fourth is equipped on Sslen'ck when he joins the player's party.
BloodOpal: Only three can be found in the game. One is found in a chest in the Sandflow Caves, another from the merchant outside the Armor and Weapon stores in Aeropolis, and the final drops from the Bone Demon in the Desert Path.
Silver Ore: Only four are available, but five are required to craft everything. It is recommended you craft the Buzzsaw Arm and Titan plating, as they teach reactions Legion cannot learn otherwise; as well as the Steel Stole, as it teaches reactions several playable characters cannot learn otherwise.
Candriathope: Only four Candriathopes exist in the game. One is found in a chest in Lifewood, one in a chest in the Sandflow Caves, one can be bought from the Goznor Secret Shop, and one can be bought from the Aeropolis Magic Shop. Crafting all craft-able items requires five Candriathopes, though you can obtain a Regal Crown as a drop instead of crafting it. Using Gemsplosion with a Candriathope equipped is the only way to deal Fig-elemental damage. It is recommended you craft the Titan Plating, as it teaches reactions Legion cannot learn otherwise.
Unlike other playable characters, each skill in Legion's skillset, Mimicry, is learned by being targeted with a corresponding enemy move. Some of these skills are only available for a limited time, since the enemies that teach them disappear.