Whether to give Hank crystals in Elex 2

While exploring the fort (the headquarters of the berserkers), the mysterious merchant Hank will approach you and offer to provide you with extremely valuable items if you give him 250 crystals.

Should I give Hank the crystals?

Hank is located near the alchemist's house in the Fort. As soon as you approach him, he will automatically start a conversation and offer a deal. He promises that if you give him 250 crystals, he will return to you in a few days with some valuable items.

If you agree, then return to the same place after 2-3 days. Hank will give you a gold ingot if you give him one of the items. Hank will say that Vivian in the Castle will buy a gold bar from you. The quest "Barter with Hank" will follow.

After talking with Vivian, you will learn that the gold bar is fake and worthless. You can no longer find Hank in the Fort, but Tilas (who is in the house Hank was standing in front of) will tell you that he may have gone to the Crater. Hank is indeed in the Crater and his location will be marked on the map. However, the trickster will not want to part with the crystals - if you want to return at least some of them, you will have to kill Hank. You won't get anything by giving your crystals to Hank other than the ability to complete a quest that will earn you experience points.