new xpac changed the dailies to a semi-seasonal system where one of the rewards you can choose is a legendary starter kit. you can pick a precursor from a small selection and one of the expensive gifts to get a headstart on crafting with.

Not from the gem store, the Wizard's Vault. The daily system has been replaced. Currently there is an option to buy a legendary starter kit. It contains a limited set of legendary sets (there's only 4 to choose from), that give you the Precursor weapon, the weapon specific gift, and a random Gift of Might or Gift of Magic.

It's a really great boost for crafting a legendary weapon and worth grabbing. I'm now about 500g away from my next legendary weapon and I literally just finished one a few days ago. It's going to take a while, but it's exciting stuff!

Kits that include the precursor. Not completed legendaries.