The Fractal Beholder's Eye Rays should be +16 ranged touch because outsiders give full BAB and it has a Dex of 18.

Quote Originally Posted by Fractal Beholder
Immunities: Fractal Beholders are immune to critical hits, petrification, polymorph, poison, paralysis, sleep effects, fatigue/exhaustion, stunning, and nonlethal damage.
Quote Originally Posted by Fractal Beholder
Splitting (Su): When a Fractal Beholder fails a Saving throw against any Spell or similar effect that would cause it's death, petrification, polymorph, or similar status that would immediately remove it from the fight it splits into two Fractal Beholders, each with half of the hit points of the original. One of the two suffers the effects of the failed Save while the other does not. Fractal Beholders with less than 10 hit points lose this ability and cannot be divided further.
How do the bolded sections interact with each other?