Resistances

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I seem to recall someone doing a study on these a while back but I can't remember... Anyways, I just did some experiments with wands of lightning and rings/cloaks of electricity resistance. I was bouncing lightning bolts off walls two spaces away from myself. I found some interesting things...

With no resistance I consistently took 18-19 damage per shot. With 15 resistance (one ring) there was a dramatic, but irregular drop -- damage taken now ranged from 1 to 17, tending to be closer to 8 or 9 points. With 30 resistance (two rings) I took nearly no damage. I spent probably 16 shots, and took only 3 points from the first one and 1 point from a later one. Other than that I took no damage at all. And finally, with 55 resistance (2 rings + cloak), damage appeared completely negated.

Note that I did have 1036 base HP. Some stats may influence the damage. I would suspect that if any did, they would be endurance and/or agility.

I'm still confused though. I can't see a trend to the damage reduction. The closest thing to a geuss that I can come up with, is that damage is reduced by Resistance - RAND(Resistance / 2). I don't have the source on my HD anymore; someone who does have it could look this up to verify... Or do your own study. I was going to test with acid as well (by drinking it) but I got bored.

Another think I'd like to check is to see how much resistance increases on cloaks with enchantment.