Is it elvish possible to kill the pig?i killed him with kensai,but with an archer this is a diffrent story..........

Solo I assume?

Should be easier in fact, Ilyich doesn't have any means of hasting himself, while you can get your hands on two Oils of Speed. Assuming that you managed to separate him from his gang (lure him to the center room and close the door as soon as he's in), you should be able to constantly pelt him from a safe distance, just keep moving and keep your distance from him, since you will be faster. He'll take a good while to kill with 3 Large healing potions, but you should be able to do it within the 5 turns the Oil gives you. Killing the Greater Otuygh can be a problem since he's immune to missile damage (?), but Horror works great against him if you're anything but Lawful Good.

There's unfortunately nothing you can do about the demon, maybe if you miraculously managed to kill Kamarov and pick up her crossbow with +3 Bolts, while simultaneously avoiding everyone else. But that's never going to happen, so just trap him behind a set of doors, lure out the Golem next and kill him however you prefer, then lure out Ilyich.

The rest of the gang I would handle in the following manner

1) Snipe the cleric once to cancel his Fallen Deva summoning.

2) Employ Hit'n'Run tactics to pick off Kamarov, she's the biggest threat since she's the only one who can really hurt you even when you're hasted. Just make sure to hit her as often as possible while constantly keeping your distance to Rasputin and the cleric, since she'll probably kill you first if you're not quick.

3) Deal with Rasputin and the cleric the way you killed Ilyich.