Ring of Power (Quest)
Greak Oak to Ring of Power
4n, nw, 2n, up, 8n, pray to severan (skip praying if you're evil aligned), 2s, e, 2up, push brick, inspect sword (a spectre will attack), wall, 2 down, w, n, move tapestry, down, 3w, n, down, 3n, 4e, open coffin, get sword from coffin (You should now have Lightbringer.), 5w, open coffin (Gunthar autos if you're good; if you're evil he'll trade the sword for the Ring).
From Ring of Power to Great Oak (Back)
e,3s,u,s,e,e,e,u,move tapestry,8s,d,s,s,se,4s
Info
'Rub Ring' will up your main stat by 2, and your 2nd stat by 1.