Re: Back In The Saddle Again
DR is Damage Resistance. Any physical damage, such as weapons, rocks, arrows, bullets, etc. is absorbed by the DR first. The remainder gets through.
ER is Energy Resistance. There are 5 types of energy, though I tend to include one or two others. Acid, Cold, Fire, Shock (electricity) and Sonic (sound), though I usually include Force and Shadow. Technically, Force should be opposed by DR, but doesn't work that way.
Aiming gets you a +1 bonus per round/per range increment, up to a max of +5. That is, you can aim for one round at point blank range, for two rounds at the first range increment, three rounds for the next range increment. The reason for this is that at point blank range, your target moves too much too quickly, whereas at farther ranges, you need to take into account motion, wind, etc.