Creatures

Master of Magic has a fairly large bestiary; the stats are somewhat dubiously compatible with GURPS, but are often close enough that it's at least plausible to try. My general rule of thumb is that one shield is a point of DR, one sword is 0.4d6 crushing or burning damage, 0.33d6 cutting damage, or 0.28d6 impaling damage, one life is 4 hit points. 1 life creatures are usually given 8 hp and -2 to DR. Creatures that are more hard to hit than tough may be given fewer HP and higher active defenses.