Saulang in Treeth holds a ring that increases one's speed. Find his house and somewhere you will find his ring.
The quest:
From the west gate of Treeth, e, 6s, 8e, kill the high priest and take his yellow key.
When you have the key, from the west gate, e, 3s, 3e, n, e, u, kill Saulang and take his scroll (2 angels will attack). d, w, n, d, lsay speed. And you have the ring.
Rub the Ring of Speed. It temporarily increases your dexterity by 2. The ring can be used after other stat boosts.