Any win is an achievement when it comes to IVAN.

As part of "The Cheap Bastard's Guide to LIVAN", I thought i'd just release this bit until the guide is done.

MUSTARD GAS - YOUR FRIEND
A mostly disliked item due to characters being dissolved by a nigh-invisible cloud of lingering mustard gas formed by the character throwing said grenade and forgetting about it. However, with the right info, you can turn this deadly contraption into a money making, looting (and ass-saving) machine!

Starting Off
1) Stock up on dwarven gas grenades full of mustard gas. Any and all you find should be picked up and stored in a container to prevent them from exploding on you due to the enner or mines or whatever.
1a) OPTIONAL: Getting Ivan's gas mask will help ensure you don't get dissolved by accidental gas exposure, but any kind of gas immunity will do. Not necessary provided you are careful and check tiles with (L)ook.
2) Having and END of 10 (e.g. HP = 37) gives you a very low chance of surviving the effects of mustard gas should you be exposed to a cloud without protection. Raise END at least 2 levels if you can't be bothered being careful or obtaining gas immunity.
3) Although not the best use of a wand of cloning, having this and a few scrolls of charging will help raise your supply of mustard gas grenades. Just use the same technique as you would for scrolls of change material: Place 4 grenades on the ground, step 1 step away, zap them, charge wand if needed, zap again, repeat ad infinitum. And you are going to need a lot if you want to take on Attnam or Mondedr. The least you need to make the Dwarven Vault reletively safe is 21, and even then there are 3 people left (The shopkeeper and 2 dwarven guards).
4) SHOULD YOU BE EXPOSED TO MUSTARD GAS WITHOUT PROTECTION, R(U)N OUT OF THE CLOUD AND REST (h) IMMEDIATELY.

Putting The Grenades To Use
The best part of using mustard gas is that if you kill somebody with it, the game does not determine it to be your doing. That means you can "assassinate" people and steal their stuff.
In short, all you need to do is find your target, and throw the grenade at a wall next to them. This results in the gas spreading out, engulfing the unlucky sod and ensuring a slow and painful death.
e.g.

############O##
#------------X#
#-------------#
#-----------Y-#
###############

Y = you and X = Your target and O = The wall you must throw the gas grenade at to kill the target via gas.

Using this method you can do the following:
1) (possibly the most useful thing ever) Eliminate most of the people in Attnam to make winning the game easier. You can't get Petrus of course, and anyone who isn't standing near a wall is harder to "assassinate", but not impossible (as detailed later). Possibly the most usefull part of using mustard gas in attnam is that you can kill those 2 damn mystic frogs and Haedlic Gaedon.
2) Murder shopkeepers to steal their stock. Don't worry about shop guards, they don't mind if you take things so long as the shopkeeper isn't around. If you are using this against the shopkeeper in Attnam, make sure to kill the slave with gas first, or he will take most of the stuff in there and make a run for it. Or you could buy him I guess...
3) Kill the librarian! (After science talking and using the "library trick" to suck his gold dry of course) And steal everything he owns.
4) Kill everyone in Decos's chamber (excluding decos himself)
5) Sterilize most of the dwarven vault and gain 2 illithium gauntlets of strength +4, an octiron plate mail, 2 unique weapons, the blessed shield of the phoenix, the golden shirt of the jaguar (haste, polycontrol, and telecontrol), a spider silk cloak of electricity resistance, a diamond belt, 2 adamant boots of strength and much more! Very useful for those not interested in getting their INT up.
6) Teleport a pile of them in the enner's lair. He doesn't stand a chance.
7) Get that helmet of piercing perception off the patrol guard in Attnam

DIAGRAMS!
Added in the attachments. The red spots on the walls are which walls you should throw the grenade at to be most effective and economic (by that I mean use less grenades). The blue part of the red dot shows what direction the wall should be hit from (so you need to hit the wall with the grenade on the part where the blue is on the dot). Green spots are walls that should be hit after you're done with the other spots and should only be done provided no one is in the way. Please note for Attnam many of the spots require you to be in the mustard gas after throwing a grenade. Gas Immunity is highly recommended.

I was playing IVAN yesterday and... yes the enner's screams can set off active mines on the level, although I didn't have any in my inventory go off. That's usually why there aren't any mines on the enner's level.

Hey that makes me think about the conversation you can have with the veteran guards at Attnam. They sometimes say not to believe Haedlic Gaedon's story about slaying the enner beast because in reality he stepped on a mine and died. But the enner's screams set off mines... so...?

4zb4's mondedr pass guide:
OPTIONS
1) Read. And starve. Gain some INT and WIS. Lose most everything else.
2) Give to the mystery man in New Attnam (he's usually north-east of the sumo's house) to reveal the location of Mondedr on the world map.
3) Sell for quick cash
4) Use to train DEX

The Large and Mysterious Saga of the Pantheon
Gas Grenades

First born son/daughter is not in any current version or variant of IVAN.
4zb4 is right on this one, it's just not generated

Uh, taraN. That's not a knight win if you have the justifier.

LIVAN's easy because of one small flaw... Mustard gas. As detailed in "The Cheap Bastard's Guide to LIVAN" made by me and soon to published on the forums upon its completion.

Don't forget Atavus too, minus the hurting part.