There's a cauldron, or a portal of mist, in the armory in most towns. Put it in there and it'll convert it. A tower shield is generally better if you don't have a lot of dodge and you're 2x+ in shield use.
~ Nuadjha, the Briar Fox
You inhale deeply upon your pipe, puckering your lips as you send out three rings of smoke before you, then puff out a small vine of smoke that darts right through all three which causes them to disperse in a hazy shroud!