Vrecknidj said:
Here are some different ways of looking at things. Here are some in-game ideas.
However, Psions can get it too.
I prefer to think of it as Arcane casters get some types of limited spell protection, divine casters get different types of limited spell protection.
For example, arcane casters can get Lesser Globe of Invulnerability and/or Globe of Invunerability and hence already have both lesser (doesn't affect higher level spells) and greater (blocks all low level spells, not just ones which have spell resistance) forms of Spell Resistance. Clerics cannot get this.
Arcane spell casters can also acquire Spell Turning which is again, more powerful in some ways, less powerful in others to Spell Resistance. Most Clerics cannot get this.
Also, arcane types can get similar protective effects (some more powerful, some less powerful) by crafting a Robe of the Archmagi, a Cube of Force, a Lavender/Green Ioun Stone, a Rod of Abosorption, or buy or have someone else craft them a Mantle of Spell Resistance.
I don't think it is critcal in a game for all types of spell casters to have the exact same type of spell protections.
If somebody started giving the coolest types of divine spell protection to arcane casters, they should also give the coolest types of arcane spell protection to divine casters. IMO.
I say if it is not broke, don't fix it. If your arcane spell caster wants Spell Resistance, have him hire a Cleric to walk around casting it on him.
