The main advice when beginning to play DC Stone Soup is to learn which monsters you can kill at your current level, and which one you need to avoid fighting at all cost.
When to fight and when to run away.
Once you begin to estimate a monster power in comparison to your current level, your characters will survive a lot longer.
By example, your character is good enough to deal with orcs, priest orcs and sorcerers orcs, then for the first time in this dungeon you see a yak, so you think that your character should be strong enough to take on it.
Wrong, everytime i saw a yak for the first time in a dungeon, i was never at a level i could afford to take on one in close combat, i always needed to use wands or some powerfull spells.
Then you need to learn which monsters are always in pack.
In the case of a yak, not only they are dangerous killers individually when you meet one for the 1st time in a dungeon, but they are never met alone, there are always several of them. So be very prepared if you see a yak for the 1st time, or if you don't have any good equipment like good wands, or very good spells, run to the stairs to avoid a stupid death.
Sigmund, or any named characters, usually they're stronger than you when you meet them. Usually, because a few of them, like Ijyb are usually +/- at your level when you meet him.
Just beware sometime along their regular equipment and spells, those named monsters have wands, and then they can become much more powerfull than usual.
Some monsters you know you can take on 1 on 1, but not several of them, in this case the stair tactic is good.
By example you have a few Orc fighters, and 2 Orcs warrior, at your level you know you can kill an Orc warrior, but you're not yet strong enough (or don't have good enough stuff for this) to kill 2 in the same time.
See if you can get on a stair with only 1 Orc warrior adjacent to those stair, climbing will bring only him against you, the other Orc warrior that would be a bit away will not follow.
And in case you have no way to run or outrun those, never ever fight them in the open, always try to get the fight into a narrow corridor so you'll always have a one on one.
http://crawl.develz.org/wordpress/on-the-way-towards-0-7
Looks like armor is slightly better in 0.7.
Seemed good, until i notice
Remove Death Knights and Thieves.
Huh ? why ?