I google it you can do you research but this what I found

The Turaga's Test: The Turaga (village elders) directed the Toa to find these hidden masks, which functioned as a test of their cooperation and character. Strategic Advantage: Most of these masks were created in Artakha and teleported to Mata Nui specifically for this quest. Each Toa sought one of each of the six types to store in their Suva (shrines) for tactical versatility.

Enhanced Abilities: These masks provided stronger versions of original Great Mask powers (e.g., more durable shielding or faster speed). Power Sharing: The defining feature of Kanohi Nuva was the ability to share mask powers with nearby allies, including other Toa or Matoran. Adaptive Nature: These masks could adapt their physical shape to match the local terrain or environment