I'm glad I was able to find a decent picture for this. It's reprinted without permission, so WOTC can demand that I remove it; in the meantime, I'm going to enjoy the effect it has.
Try to imagine this creature having one more arm on her right hand side, making seven arms altogether. Now imagine that she is 12 feet tall. There. We should have a degree of terror now.
She is standing in a pit which consists of earth scooped out, about six feet deep, but with shallow enough sides that Delfig can easily see into it. To the Demon's right there are the carcasses of two horses, more or less correct in proportions to her size (25' long, 11 feet at the shoulder), now obviously dead, and the broken remains of a cart somewhat attached to them. All about her, in the pit, in piles or scattered, are bodies and body parts, perhaps a hundred humans in all.
Against this huge demon stands only one individual, quite beautiful in appearance, in stature all of five-foot-nine. He is fighting with a long sword, toe to toe. Each round the demon's blows land in a series, one after another...but it is quite clear after less than a half minute (and Delfig stands agog during that time) that she is unable to hurt her opponent. There is some sort of invisible shield, which glistens golden-yellow each time one of her blows lands. Two of the weapons she is using, a mace and a morning star, each spin off a ball of green or blue lightning each time the strike the human fighter's shield of impenetrability, these breaking into bolts which then dance over the buildings surrounding the square, causing the effects Delfig witnessed from the top of the building a distance away.
Though it is clear that the creature cannot strike the human, it is equally clear that he is keeping her from moving off; he has her trapped against the sheer edge of the mound as it appears on this side; he occasionally strikes and causes her damage, and she cannot leave as long as he lives.
It is also true that he is growing weary. Often times he must use both his arms to swing his sword; his face and his body show that he is at the edge of his reserve to go on fighting.