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.
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.
Name and Description
Uses
How to Find
Rise Booster
Increases the levels of enemies in Autumn's Rise and unlocks new loot drops.
An aura that adapts with your current element mode.
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.
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
Uses
How to Find
Cool Bar
It's simple and elegant.
A floating crowbar with glasses that spins while idle.
Chest at the end of the secret lab during the Best in the West quest. (PC exclusive)
Orange Twister
A fluffy orange cat that follows you around!
A small orange cat that will groom itself when idle.
Mine Detector
Laser Pickaxe, 
