This creature is a small rainbow-hued cat with a single straight horn growing from its forehead and a pair of butterfly wings.
CR 5; XP 1,600
AC 18, touch 14, flat-footed 14 (+3 Dex, +4 natural, +1 size)
Speed 40 ft., fly 60 ft. (good)
Str 10, Dex 16, Con 16, Int 13, Wis 15, Cha 15
Pattern Amplification (Ex): A rainbow cat's colorful pelt shimmers with all the colors of the rainbow synchronizing with nearby pattern effects. Pattern effects created with spells and spell-like abilities within 60 feet of a rainbow cat have their caster level increased by 1. All creatures within the aura suffer -1 penalty to saving throws against pattern effects. This modifiers stack to a maximum of +3 to caster level and -3 to saving throws.
Prismatic Affinity (Ex): A rainbow cat is never blinded by prismatic sphere, prismatic spray, prismatic wall, and similar effects and has effective Spell Resistance of 26 against them. Unlike most other cats, rainbow cats are completely immune to fascinated condition caused by visual effects.
Rainbow Arc (Su): A rainbow cat can project a ray of prismatic light from its horn with a range of 60 feet. Rainbow arc deals 5d6 points of damage and exposes the target to rainbow burst.
Rainbow Burst (Su): A creature struck with horn or rainbow arc has to succeed a Will saving throw (DC 15). Failure exposes them to a burst of light that causes one of the following conditions: blindness for 1d4 rounds, fatigue for 1d4 rounds or sickness for 1d4 rounds, as chosen by the cat. If the attack that triggered the rainbow burst was a confirmed critical hit, the target also becomes stunned for 1d4 round on a failed save or staggered for 1 round if successful.
Like many other magical beasts, rainbow cats are results of magic gone wild. This particular species arose from a group of semi-feral cats dwelling in highly magical ruins. There, many generations of cats were exposed to lingering magic; residual power flew through the area and the creatures living there, slowly imbuing them with increased intelligence. They also acquired appearance and abilities corresponding to various magical effects dissipating in the ruins: for the ancestors of rainbow cats it was a series of prismatic walls protecting various sections of the ruins. After a few generations rainbow cats acquired limited ability to pass those wards and to harness the prismatic magic infusing them. With their heightened intelligence and ability to fly they spread from the ruins and into the world around them.
Rainbow cats are curious and yet very jaded beings—they enjoy new things but coming from a high magic environment they are accustomed to seeing strange, terrible, and completely weird things, rarely matched in more mundane places. They like to occasionally interact with other intelligent beings and usually avoiding violence, unless their young or their territory is threatened.
The average rainbow cat is 2-½ feet to 4 feet long and weights 20–40 pounds.