The character conjures up a phantom watchdog that is invisible
to everyone but the character. It then guards the area where it
was conjured. The phantom watchdog immediately starts barking
loudly if any Small or larger creature approaches within 30 feet
of it. (Those already within 30 feet of the hound when it is
conjured may move about in the area, but if they leave and
return, they activate the barking.) The hound sees invisible and
ethereal creatures. It does not react to figments, but it does
react to shadow illusions. It is stationary.
If an intruder approaches to within 5 feet of the watchdog,
the dog stops barking and delivers a vicious bite (+10 attack
bonus, 2d6+3 points of damage) once per round. The dog also gets
the bonuses appropriate to an invisible creature. (For most
defenders, the invisible creature gets a +2 attack bonus and the
defender loses any Dexterity bonus to AC.) The dog is considered
ready to bite intruders, so it delivers its first bite on the
intruders turn. Its bite is the equivalent of a +3 weapon
for purposes of damage reduction. The hound cannot be attacked,
but it can be dispelled.
The spell lasts for 1 hour per caster level, but once the
hound begins barking, it lasts only 1 round per caster level. If
the character is ever more than 100 feet distant from the
watchdog, the spell ends.