as hopefully you remember, now that you have your metal bars and cut garnets, time to head back to kerian. the dragon crafter gives you a verbal pat on the head and a new form with instructions to create a garnet tipped claw. scribe the new form and head to the scaleforge, located behind and to the right of kerian's pedestal.
since your next quest is a combat one (altho kerian will give it to you), it is prolly a good idea to equip your new claw. as with all things like this, first you locate it in your inventory. highlight the claw, which will also give you the stats for the item, and right click. choose the equip option and bring up your equipment screen (via the blue gem or the keyboard shortcut, if you don't have it open but minimized like i usually do) to make sure it is equipped.
speaking of inventory, you prolly have a bunch of stuff you don't need right now, but might come in handy later. next time, before we go on our next adventure, i should introduce you to the vault. something to look forward to! ;-}