Re: OpenRPG help, please.
Spell Resistance is a Resistance to magic that allows to try to resist to some spells. (It should also depend on the kind of spell cast) For a caster to bypass this Resistance, a roll of (1d20)+caster level is required, and the result should be equal or higher than the Spell Resistance of the target. In short, Spell Resistance roughly works like AC for magical attacks, and can be granted by spells, items and to monsters.
Saving Throws is a chance given to a character to escape an attack, such as dragon breath or something along these lines. There are three categories, which are Reflex, Will and Fortitude, respectively based on Dexterity, Wisdom and Constitution. The roll is done with a d20, your bonus in the linked ability plus a bonus from your class and your level. (A level 20 player with a class able to defend itself well will have +12 to her saving throws) The effects of succeeding in a saving throw may depend on the attack which caused the saving throw as well.
Hopefully it will help you, and I even tried to look up in the correct source rather than in my old memories of D&D2 games.
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