now upon that rocky spur the sun shone , but over all the hills and mountains at its back a black cloud brooded , for there was angamandi ; and tinuviel fared on not daring to look up at that gloom , for fear oppressed her , and as she went the ground rose and the grass grew more scant and rock-strewn until it came even to a cliff , sheer of one side , and there upon a stony shelf was the castle of tevildo .