Devotion to Gafelion

Gafelion, the Celestial Smith, has bestowed this ritual upon his followers.
You take 100 grams of metal and perform the ritual, which involves inscribing the symbol of Ryfélir onto the metal. The metal must be in metallic form, and at least 90% pure. Depending on the value of the metal, it confers a small bonus to HP, and a damage buff (of that weapon's damage type) to any melee attacks made with your pact weapon or your hexblade. Once you cast this spell, you cannot cast it again until you finish a long rest.