Spell Resistance I'm so confused.

[armorwars1]

Greetings
The other day, some friends and I were playing the Curse of the Crimson Throne adventure path. While we confronted a particular NPC, a combat ensued. During the combat nobody could hit this guy so I attempted to use a Burning Disarm spell on him and the GM asked me to make a Spell resistance check, is that how it works? The Burning Disarm spell targets an object not the creature or am I missing something? Also we attempted to cast dispel magic on him to perhaps remove his defensive spells the GM asked us to again roll a spell resistance check which failed. This NPC's armor class was unhitable and no spells worked on him because his SR was better than 25 and yet the GM stated that he was to be defeated in order to proceed and only 3 of us lived through this encounter. After this disaster the GM admitted to being fairly new to pathfinder having played DnD 3.5, and after reading the bestiary, he figured it was the same. He said if I could discover to correct rules he would implement them but until then his ruling stood. And so I'm here asking the Pro's.

[Matthew Downie]

Are we talking about a

Spoiler:

Rakshasha

?
I hate fighting those guys. DR, good AC, spell resistance... If your party isn't built to handle them, you're going to have real trouble.

[Vidmaster7]

I haven't gone through the adventure path. rules wise however:

spell resistance
you must make a caster level check (1d20 + caster level) at least equal to the creature's spell resistance for the spell to affect that creature. The defender's spell resistance is like an Armor Class against magical attacks. Include any adjustments to your caster level to this caster level check.

burning disarm does allow spell resistance if the enemy is using it I'm fairly certain you have to roll against it to effect something he is wielding.

However if you check out dispel magic "Spell Resistance no" spell resistance does not apply against dispel. also that is the same as in 3.5