The Mask of Giants
Despite its name the mask pertains more towards Titans, a sort of "giants of giants" race within Venia, with it's blue hue and large tusks.
This mask allows the wearer, if human, to increase their size to that of a member of the Giant race. Likewise if a giant should wear this mask, they would increase to that of a Titan.
This is one of the few masks that only works on certain races. It is more effective of Giants due to Titans being around three times the size of Giants while Giants are only twice as tall as humans.