1. Only physical damage is multiplied into a backstab or critical, elemental damage is *then* applied, and strength damage last. I think. This means: FOA +3, 18/00 Str, backstab x5 critical hit -
1d6 + 3 piercing - average of 6 damage. x10 = 60, +elemental = 63 + Str = 72.
2. Rolled separately - you'll notice that weapon descriptions say "xdn + y" - where x, n and y are integers. x is the number of dice, n is the number of sides each die has, y is guaranteed damage if you hit.
3. Armours generally provide the boni in their description, usually only AC bonuses. Spell armours usually provide some resistance to something.
4. Glitch.
5. Any weapon which is usable by a low level (no UAI) thief can be used to backstab.
6. Because they have no way of telling if they're behind you.
7. No. Damage reduction is covered by your resistances - all bar Magic resistance are percent damage reduction, MR is a percent chance of ignoring most spells.
8. Anything which reduces or raises something will stack with everything. Only the last equipped thing to set a value applies, and it cancels all of the reductions/raises, so equip setting items first. If a given value is absolute, assume it sets. Swords which set a value (such as Carsomyr's 50% MR) reapply that with every swing.
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