I got a Tengu Chaos Knight all the way to Vaults:4 a few days ago, when Xom decided to switch my +8 randart Chaos Dagger (which was a Xom gift earlier) with Saint Roka's cursed -2 Longsword, and then teleport me across the dungeon into a vault filled with Giants and Tengu Reavers a few turns later.
Thing is I STILL could have likely prevented that death, AND gone to get my dagger back. But instead I let myself get angry about it. Not the way to win Crawl.
![Sad :(](./images/smilies/icon_e_sad.gif)
Since then I've been playing more Xom characters; not necessarily Chaos Knight, actually TeFE of Xom feels pretty good.
God DAMN, you should see some of my mutation lists! I have had close to TWENTY good mutations on some Xom characters, all of them gifts.
If players are serious about playing Xom, I'd usually not recommend Chaos Knight as the starting class; other classes can pick Xom at an altar using a class with superior "killdudes power" already. If you want that starting chaos brand weapon, Chaos Knight may be viable if you're playing a stabber character such as a Spriggan, selecting the Shortsword to start.
Also, Longbows or Arbalests (or Triple Crossbows) of Chaos are
glorious weapons. The heavy bonus damage from randomized brands such as Electric or Distortion at a far distance is exclusive, being able to confuse or petrify your enemies before they get to you is a huge relief, and when you get the "iffy" effects such as berserk or duplication, they're too far away from you for it to be worth outright panicking over. I've also seen some special effects that only chaos launchers can inflict, such as spider-webbing the target. Some people play Xom just for the chance to get an amazing chaos launcher. But there are other reasons to play Xom too, such as huge lists of great mutations, or being bailed out of nasty situations (half the time; the other half would be made worse by Xom's power, but since these are situations where you'd have an escape plan ready anyway, what's really so different?), or just for having fun as someone else said. But not every character can benefit from Xom, and not every
player can either.
Giant Spiked Clubs of Chaos are amazing too, and I do see a good number of Ogre Chaos Knights being played. There's another one.