Silver Lum
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A Silver Lum is a very special kind of Lum found in Rayman 2: The Great Escape that is created by fairies. In Rayman 2, they give Rayman brand new powers, and also upgrade the ones he already has. They are the biggest, and only lums without eyes or wings, although in Rayman 3 the Red Lums are shown in this state as well. You cannot collect Silver lums yourself, but Ly will give you them when she has collected enough energy.
However, in the Gameboy Advance version of Rayman 3: Hoodlum Havoc, silver Lums can be collected throughout the game and they give Rayman an extra life.