Add-Ons are Items that can be toggled in the Item-Menu. Many of them are cosmetic, and it is only possible to have one of each cosmetic type (one skin, one step effect, one aura and one pet) active at a time. Detectors and boosters, however, assist in-game in different ways and can all be active at the same time.
Detectors help to detect items, by emitting an impulse and displaying the number of the detected item, upon entering the room.
| Name and Description
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Uses
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How to Find
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 Mine Detector
| Emits an impulse when entering a room that contains missing mine equipment.
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Detector for locating  Laser Pickaxe, Laser TNT and Mining Docs in the Temple Mine.
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Given by Advisor in Bergen Village's Seeker Hub for the Digging Up the Past sidequest.
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Chest Detector
| Emits an impulse when entering a room that contains an unopened chest.
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Detector for locating treasure chests.
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Buy from Rhombus Square Curios Trinkets for 25000 Credits.
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The Chest Detector activating.
The Mine Detector activating.
Skins change the appearance of Lea.
| Name and Description
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Uses
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How to Find
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Holiday Hat
| A special hat you got from Holiday Man for helping him. Wear it proudly!
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Gives Lea a Santa Hat in the overworld and main menu (but not in cutscenes).
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Given by Holiday Man as a reward for the Gifting for Fun! sidequest.
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Kunoichi
| Run like a Ninja? Now you can look like one too!
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Dresses Lea up in ninja garb in the main menu and overworld (but not in cutscenes).
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Indiegogo timed backer exclusive for backers at the Ninja Perk and above; released to the public as DLC on December 13, 2018
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Kunoichi skin in the Main Menu
Kunoichi Lea skin in the overworld
Holiday Hat skin in the Main Menu
Holiday Hat skin in the overworld
Step Effects make Lea emit some effects when she walks or jumps.
| Name and Description
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Uses
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How to Find
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Sparkly Boots
| They will make you sparkle with every step. Literally.
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Makes Lea emit star sparkles when she runs, as well as play a shimmering sound when she jumps.
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Bonus Code gimmick
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Holiday Boots
| Take out the presents before putting in feet!
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Makes Lea emit snowflake sparkles and holiday bell sound effects when she runs/jumps.
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Obtained from Holiday Man after completing the Gifting for Fun! sidequest and obtaining all four elements
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Particle effect from the Sparkly Boots.
Particle effect for the Holiday Boots.
Area Boosters are purchased in Rhombus Square. There are six boosters in total relating to the six main areas of the game. Acquiring and enabling the item will cause enemies of the area to become stronger through increased levels and stats as well as drop rare gem stones used for trading. Each booster requires a legendary item found from its corresponding area.
Auras are visual effects that appear around Lea.
| Name and Description
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Uses
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How to Find
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Element Aura
| An aura that adapts with your current element mode.
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Surrounds Lea with a colorful aura matching her current element that trails behind her when when she runs. In Neutral mode, this is replaced with a shimmering afterimage effect.
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Menacing Aura
| A very dark and menacing aura.
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Surrounds Lea with a dark purple aura that trails behind her when she runs, along with the floating character
ゴ, used in manga and anime to represent an ominous rumbling.
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Element Aura in Neutral mode.
Pets are small, cute creatures that follow Lea around. They are purely cosmetic, but Lea will pet them if she is left idle beside them, which will make them bounce up and down and emit hearts.
| Name and Description
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Uses
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How to Find
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Orange Twister
| A fluffy orange cat that follows you around!
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A small orange cat that will groom itself when idle.
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Good Boy
| A very good boy to follow you around, everywhere.
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A dog resembling a Shiba Inu that paws at the ground when idle.
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Baby Peng
| A cute baby Pengpeng that can't even run!
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A small Pengpeng that follows Lea by sliding on its belly and falls asleep when idle.
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FDNI Fox
| Almost a dog! Or a cat! No one knows what it says.
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A fox that runs around in circles when idle.
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S-Rex
| S-Sized Dinosaur born to munch.
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Lil' Reap
| Don't be a creep, don't make a meep, or he'll make you go to sleep.
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Red Liz
| A dragon flying at your side even in the darkest of times.
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The Orange Twister pet standing with Lea.
The Baby Peng pet standing with Lea.
The FDNI Fox pet standing with Lea.
The Good Boy pet standing with Lea.
Mine Detector
Laser Pickaxe, 
