Hi all quick question
If a creature has dr/10 magic is it effected by normal fire
A creature with this special quality ignores damage from most weapons and natural attacks. Wounds heal immediately, or the weapon bounces off harmlessly (in either case, the opponent knows the attack was ineffective). The creature takes normal damage from energy attacks (even nonmagical ones), spells, spell-like abilities, and supernatural abilities. A certain kind of weapon can sometimes damage the creature normally, as noted below.
Damage Reduction never applies against energy based attack, only weapon attacks.
DR/10 magic means that nonmagical weapons (weapons that don't have at least a +1 enhancement) have their damage reduced by 10.
If you wanted something to resist fire damage you would need Energy Resistance.