Ring of Stun resistance. Without spoilers / metallurgy, we're at a loss to know how to behave.

Side question - what missile skill should throwing gold train, if any?

No spoilers needed to know this, unless you consider the manual too spoily.

If you don't know what it's made of, then play it safe and remove it at start.

I agree, a Mist elf should not start with lower metal items equipped, it's not as if entering the Drakalor Chain is his/her first day on the job.

Doesn't make sense, though, for a being that dies when it wears an "impure metal" to walk into the Drakalor Chain wearing an object of impure metal. So that certainly needs to be fixed.

Yes, as you can see, I realized that is illogical.

I've also experienced strang behavior with rings.

1) Roll a wizard till you get some metal rings
2) Go to Terinyo
3) Equip rings
4) Wait several turns - no messages
5) Exit Terinyo - death immediately.

Sometimes it doesn't work and damage applies normally in Terinyo itself. Sometimes it's this way.

It's a combination problem: I messed up a calculation that causes more damage than it should in wilderness. And you should not wear more than one impure metal ring. Sadly the broken calculation kills mist elves in the wilderness.

Is this related to the fact that Mist elves seem to take damage from one iron ring when they don't have gauntlets equipped? (I always thought rings went inside gauntlets; that's how ADoM usually treats it anyway). If not, I can open a separate bug report, but didn't want to clutter things up.