As far as I can tell, it doubles the dice for weapon-specific passive features. Like, the Silver sword that usually only deals an additional 1d6 psychic damage if wielded by a Githyanki now deals 2d6 psychic. And the Sword of Chaos which usually only heals 1d6 hit points now heals 2d6, etc. So any weapon that has in the description some detail of adding damage or healing conditionally, that damage/healing is now doubled
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