Legendaries
As Gift of Mastery and Fortune are shared requirements across all existing legendaries, I think they’re staying. If I were you I’d also work on slowly stockpiling the required planks and oris for the smaller Gifts of Metal and Wood, just in case. If they somehow take these out you can always sell them for a few dozen g. And save every type of lodestone or core that you find, you can never know which ones you’ll need.