Extensions are weapons in My Crypto Heroes. One hero can equip up to two Extensions. Then, the Hero status is enhanced and special skills can be activated.
Original Extensions are NFTs and are tradable both in the GUM Market and in the Secondary Market, such as OpenSea. Like Heroes, they have Rarity and Lv.
You can mint an Original Extension in the game’s Craft section. Original Extensions have a total supply limit.
Replica Extensions are copies of original items and are not NFTs. They are much easier to get. However, you can't trade them or level them up. Also, Replica Extensions expire after 7 days of use.
For more information, please see the help.